Tips, Guides & Tutorials
Practical advice for working with PDFs, images, and documents. Learn how to get the most out of your files.
How to Compress an Image to a Specific Size in KB (Free, 2026)
Hit exact KB targets (50, 100, 200, 500 KB) for gov forms, job portals, and ATS uploads. Binary-search quality + auto-downscale, 100% browser-based.
How to Crop a PDF Online (Free, Browser-Only, 2026)
Crop PDF pages in your browser — drag to select the area, pick a preset ratio, apply to all pages or just the first. No upload, no signup.
Best Free Online Markdown Editor (With Live Preview, 2026)
Online markdown editor with live preview, toolbar shortcuts, auto-save, and one-click HTML/.md export. 100% browser-based, no signup.
How to Convert HTML to PDF Online Free (Browser-Only, 2026)
Convert HTML to PDF in your browser — paste code or upload .html, pick A4/Letter and orientation. No upload, no signup, modern CSS supported.
How to Fill PDF Form Online (Free, Even Word-to-PDF Forms)
Fill PDF form online — auto-detects AcroForm fields plus underscore blanks in Word-to-PDF flat forms. Type to fill, download. Free, no Acrobat.
Regex Generator from Sample Strings: Build Regex (2026)
Regex generator from sample strings — paste 2-5 examples, get a regex with character classes + length quantifiers. Deterministic, no AI.
Regex Tester Online: How to Test Regex Like a Pro (2026)
Regex tester online — paste a pattern, get live match highlighting plus paste-ready code for 10 languages. 40+ presets. Free, no signup.
Kubernetes CronJob Tester: How to Verify Schedules Before Apply
Kubernetes CronJob tester — verify spec.schedule before kubectl apply. Plain-English description, next 50 fire times, timezone-aware. Free.
How to Test a Cron Expression Online (Free, No Install)
Test a cron expression online — paste, get plain English + next 50 fire times in any timezone. Free, browser-based. Pairs with Kubernetes CronJob.
How to Convert a Unix Timestamp to a Date (Free, Online, 2026)
Convert Unix timestamp to date online — auto-detects seconds vs milliseconds, outputs ISO 8601, RFC 2822, local time. Free, browser-based.
How to Combine Multiple Word Docs into One PDF (Free, No Office)
Combine Word docs into one PDF — convert each .docx to PDF, then merge in any order. Free, browser-based, no Office or Acrobat needed.
PDF/A vs PDF: What's the Difference? (And When You Need Each)
PDF/A vs PDF — what's the difference, when to use each. PDF/A is for archival, PDF is for general use. Conversion, validation, and gotchas explained.
Best Free PDF Editor in 2026 (Honest Comparison, No Paywalls)
Best free PDF editor in 2026 — honest comparison of PDFFlare, Smallpdf, iLovePDF, Sejda, PDF24. Pick the right one for your use case, no paywalls.
How to Make a Resume in PDF (Free Templates, No Word Required)
Make a resume in PDF — pick a free template, fill it in, save as PDF, sign and compress. Browser-based, no Word, no sign-in.
How to Convert WebP to JPG (Free, Online, No Quality Loss)
Convert WebP to JPG in your browser — drop the file, pick quality, download. Free, no upload, batch supported. Plus when to convert (and when not to).
How to Convert SVG to PNG Online Free (No Install Needed)
Convert SVG to PNG free online — pick output size, transparency, and DPI. Browser-based, no install. Plus how to handle SVG complexity gotchas.
How to Encrypt a PDF for Email (Free, Browser-Based)
Encrypt a PDF for email with a password — free, in your browser, no Adobe Acrobat. Plus when password protection is enough vs when you need real encryption.
What Is a HEIC File and Why Does iPhone Use It? (2026 Guide)
What is a HEIC file? Apple's HEIF/HEIC image format saves 50% file size vs JPG. Learn why iPhone uses it, how to open one, and when to convert to JPG.
AVIF vs WebP vs JPG: Which Image Format in 2026?
AVIF vs WebP vs JPG in 2026 — compression, browser support, and when to use each. Plus how to convert between them in your browser, no signup.
PDF vs DOCX: When to Use Each (Complete 2026 Guide)
PDF vs DOCX — when to use each, key differences, and how to convert between them. Sharing, archiving, collaboration, accessibility — all covered.
How to Compare Two PDFs Side by Side (Free, No Install)
Compare two PDFs side by side — visually with split-screen, by text content with OCR + diff, or by checksum. 4 free methods, no Adobe subscription.
How to Make Image Background Transparent (PNG, Free)
Make image background transparent — remove white or solid backgrounds, save as transparent PNG. Free methods for logos, product photos, signatures.
How to Combine Photos into PDF on Android (Free, No App)
Combine photos into PDF on Android using Chrome — free, no app install, no upload. Plus how to compress, sign, and merge the resulting PDF.
How to Convert PNG to JPG (and Back) — Free, No Quality Loss
Convert PNG to JPG (or JPG to PNG) free in your browser. Pick the right format, control quality, batch convert. No upload, no signup.
How to Annotate a PDF (Highlights, Notes, Drawings) — Free
Annotate a PDF online free — add highlights, sticky notes, drawings, text overlays. Browser-based, no install, no signup. Works on Mac, Windows, mobile.
How to Extract Images from a PDF (Free, Without Quality Loss)
Extract images from a PDF — pull every embedded image as JPG/PNG without quality loss. Free, browser-based, no install, no signup, no upload.
How to Insert Pages into a PDF (Free, Online, No Install)
Insert pages into a PDF — add blank pages, insert pages from another PDF, or rearrange. Free, browser-based, no Adobe Acrobat. Step-by-step.
How to Sign a PDF on iPad with Apple Pencil (Free, No App)
Sign a PDF on iPad with Apple Pencil — use Markup, Files, or PDFFlare's free Sign PDF tool in Safari. Step-by-step guide for one-tap signatures.
How to Save a Webpage as PDF (Chrome, Safari, Firefox, 2026)
Save a webpage as PDF in any browser — Chrome, Safari, Firefox, Edge — without ads. Plus how to clean, compress, and merge webpage PDFs after saving.
How to Reduce PDF Size on Mac (5 Free Methods, No Quality Loss)
Reduce PDF size on Mac with 5 free methods — Preview, PDFFlare's Compress PDF, ColorSync, Acrobat, Ghostscript. Pick the right one for your use case.
How to Make a Fillable PDF Form (Free, No Acrobat Required)
Make a fillable PDF form free without Adobe Acrobat. Add text fields, checkboxes, signatures using PDFFlare's Edit PDF + Sign PDF tools, all in your browser.
How to Save a Google Doc as PDF (Desktop, iPhone, iPad)
Save a Google Doc as PDF on desktop, iPhone, iPad — with comments, without comments, in any layout. Plus how to compress, sign, or merge after export.
How to Print to PDF on Mac and Windows (Free, Built In)
Print to PDF on Mac, Windows 11, Linux — using the built-in Save as PDF dialog. Plus how to compress, merge, or sign the PDF you printed afterward.
How to Generate a JWT Secret + API Key (Cryptographically Secure)
Generate a JWT secret or API key in your browser using the Web Crypto API. Hex, base64, base64url, prefix presets, bulk. Free, no signup, never transmitted.
How to Verify a Checksum on Mac, Windows, Linux (Free, Online)
Verify a checksum online without installing anything — paste a SHA-256, MD5, or SHA-512 hash, drop the file, get an instant ✓ Match. Free, browser-only.
How to Verify a File Checksum Online (SHA-256, MD5, Free)
Verify a file checksum online — drop the file, paste the publisher's SHA-256 or MD5 hash, get an instant ✓ Match. Browser-based, no upload, free.
How to Generate HMAC-SHA256 Online (Webhook Signatures, JWT HS256)
Generate HMAC-SHA256 online for Stripe, GitHub, Slack webhook signatures, JWT HS256 tokens, and AWS Signature v4 chains. Browser-based, no signup.
How to Decode a JWT Online (Free JWT Decoder, Browser-Only)
Decode JWT online — paste a JSON Web Token, get header, payload, and standard claims (iss, sub, aud, exp, iat, nbf, jti). Free, no signup, browser-only.
How to Generate Strong Password or Passphrase Online (Free)
Generate strong password or passphrase online — random characters, diceware-style word combinations, pronounceable, or PINs. Cryptographically secure, free, no signup.
How to Convert Text Case Between camelCase, snake_case, and 14 More
Convert text case between camelCase, snake_case, kebab-case, Title Case, and 12 more formats — with smart word splitting that handles XMLHttpRequest correctly. Free, browser-based.
How to Generate UUID Online (v4, v7, and Bulk Guide)
Generate UUIDs online — v4 random, v7 time-ordered for databases, v5 namespace deterministic. Bulk generate 1-1000, 5 output formats, 100% browser-based.
How to Convert PowerPoint to PDF With Notes and Handouts (Free)
Three formats from one upload: 1-up clean PDF, multi-up audience handout, notes-only rehearsal script. PPTX, PPT, ODP — free, no signup.
How to Convert Excel to PDF Without Cutting Off Columns
Wide spreadsheets get cut off when most online tools save Excel as PDF. Here's the fit-to-width fix that keeps every column on the page — XLSX, XLS, ODS.
How to Convert JSON to a Java POJO (Jackson Annotations Step by Step)
Generate Java POJO classes with Jackson @JsonProperty annotations from any JSON sample. Spring Boot ready, type-safe, with smart int vs double inference.
How to Convert JSON to a C# Class (System.Text.Json + Newtonsoft)
Generate C# classes with [JsonPropertyName] attributes from any JSON sample. Auto-properties, ASP.NET Core ready, swap to Newtonsoft.Json with one edit.
How to Convert JSON to a Markdown Table (For READMEs and GitHub)
Convert JSON arrays into clean Markdown tables for READMEs, GitHub Issues, Notion, and any GFM-compatible tool. Auto headers, escaped pipes, no signup.
How to Convert JSON to a Kotlin Data Class (kotlinx.serialization)
Generate Kotlin data classes with @SerialName annotations for kotlinx.serialization. Built for Android workflows — Retrofit, Ktor, Firebase ready.
How to Convert JSON to a Swift Codable Struct (CodingKeys Guide)
Generate Swift Codable structs from any JSON sample with auto CodingKeys for snake_case keys. Works with JSONDecoder out of the box, no decoder strategy needed.
How to Convert JSON to SQL (CREATE TABLE + INSERT in Seconds)
Convert a JSON array into CREATE TABLE + INSERT statements for PostgreSQL, MySQL, or SQLite. Auto type inference, escaped strings, fast multi-row inserts.
How to Convert JSON to an HTML Table (For Email and Dashboards)
Convert JSON arrays into semantic HTML tables for emails, dashboards, and static pages. Proper thead/tbody, HTML-escaped cells, paste-ready markup.
How to Apply a JSON Merge Patch (RFC 7396) — Complete Guide
Apply RFC 7396 JSON Merge Patches in your browser. Three rules, surprising null behaviour, when to use it vs JSON Patch (RFC 6902) — with examples.
How to Convert JSON to Excel (.xlsx) Online for Free
Convert JSON arrays into a real Excel .xlsx file with native number, boolean, and string types. No broken CSV import wizard, no signup, browser-based.
How to Convert JSON to a Protobuf Schema (proto3 Generator Guide)
Generate proto3 schema messages from any JSON sample. Auto-numbered fields, inferred scalar types, ready for protoc and gRPC code generation.
How to Convert JSON to a GraphQL Schema (SDL Generator Guide)
Generate a GraphQL SDL schema from any JSON sample. One type per shape, required fields by default, ready for Apollo, Yoga, gqlgen, and Hot Chocolate.
How to Parse JSON5 / JSONC (Comments + Trailing Commas) Online
Parse JSON5 and JSONC online — comments, trailing commas, single quotes, unquoted keys all handled. Convert tsconfig.json to strict JSON instantly.
How to Sort JSON Arrays and Keys (Canonical Form for Diffs and Hashes)
Sort JSON keys deeply for stable diffs, hashes, and snapshot tests. Optional array sort, asc/desc, case-insensitive — canonicalize JSON in one click.
How to Convert JSON to a Go Struct (encoding/json Generator Guide)
Generate Go structs with json:"..." tags from any JSON sample. Smart int vs float64 inference, one struct per shape, encoding/json ready out of the box.
How to Convert JSON to a Python Dataclass (Type Hints + Pydantic)
Generate Python @dataclass definitions from any JSON sample. Inferred type hints, nested classes, mixed-type unions — drop straight into your project.
How to Convert JSON to a Rust Struct (serde Generator Guide)
Generate Rust structs with serde Serialize / Deserialize derives from any JSON sample. Snake_case fields, rename attributes, ready for Axum and Reqwest.
How to Convert JSON to XML (and XML to JSON) Online for Free
Bi-directional JSON ↔ XML converter. Pretty-printed output, browser-based, lossless for element-only XML — perfect for SOAP bridges and RSS feeds.
How to Convert JSON to TOML (and TOML to JSON) Online for Free
Convert between JSON and TOML for Cargo.toml, pyproject.toml, and any TOML config. Tables, arrays of tables, scalars all supported. Browser-based.
How to View JSON as a Tree (Interactive Explorer Guide)
View any JSON as an interactive collapsible tree. Click to expand, search to jump, type-aware color coding — explore deeply nested JSON in seconds.
How to Analyze JSON Statistics (Depth, Keys, and Type Breakdown)
Inspect depth, total keys, type breakdown, and the deepest path of any JSON document. The cheapest first-pass before schema generation or conversion.
How to Escape and Unescape JSON Strings Online (Free Tool)
Escape any string into a JSON string literal, or unescape a JSON literal back to plain text. Handles \n, \t, \u Unicode, surrogate pairs — bidirectional.
How to Find Duplicate Keys in JSON (Catch the Silent Data-Loss Bug)
JSON.parse silently drops duplicate keys, causing invisible data loss. This guide shows how to detect duplicates with line numbers and fix the source.
How to Flatten Nested JSON to Dot-Notation Keys (and Back)
Flatten nested JSON to dot-notation keys for forms, env vars, i18n, and key-value stores. Configurable delimiters (dot, underscore, slash, custom). Round-trip safe.
How to Generate Dummy / Fake JSON Data for Testing (Free Online)
Generate realistic dummy JSON for tests, Postman bodies, demos, and fixtures. Six templates, seeded reproducible output, up to 1000 items per click.
How to Query JSON with JSONPath (Examples + Cheat Sheet)
Pull specific values out of any JSON with JSONPath. Cheat sheet of every operator with worked examples — wildcards, recursive descent, AND/OR/NOT filters.
How to Validate JSON Against a Schema (Generate, Validate, Catch Bad Data)
Generate a Draft-07 JSON Schema from a sample, then validate any JSON against it. Catch type drift, missing fields, and schema violations at the API boundary.
How to Format JSON Online (Pretty Print, Validate, and Repair Broken JSON)
Format JSON online in your browser — pretty print, validate, sort keys, and repair broken JSON with missing commas, trailing commas, or unquoted keys.
How to Convert JSON to CSV (and CSV to JSON) for Excel and Sheets
Convert JSON to CSV for Excel and Google Sheets — or CSV back to JSON for APIs. Handles quoted fields, embedded commas, and nested data via flatten.
How to Convert JSON to TypeScript Interfaces (Generate Types Automatically)
Generate TypeScript interfaces from any JSON sample automatically. Handles nested shapes, mixed-type arrays, optional fields — types in seconds.
How to Compare Two JSON Files (Structural Diff Guide)
Compare two JSON files structurally — see added, removed, and changed paths. Catch API regressions, config drift, and type drift that text diff misses.
How to Convert JSON to YAML for Kubernetes (and YAML to JSON Back)
Convert JSON to YAML for Kubernetes manifests, GitHub Actions, Helm values, and Docker Compose. Bi-directional, browser-based, configs never upload.
How to Combine iPhone Photos into One PDF (Free, No App)
Combine iPhone photos into one PDF in your browser — no app, no signup. Supports HEIC, JPG, and PNG with automatic orientation and one-tap reorder.
How to Reorder PDF Pages Online for Free (Drag & Drop)
Rearrange pages in any PDF by dragging thumbnails into the order you want. No software, no signup — works in your browser.
How to Sign a PDF Online for Free (Draw, Type, or Upload)
Sign any PDF document for free — draw your signature, type it with a handwriting font, or upload an image. No software, no signup, 100% browser-based.
How to Add Page Numbers to a PDF for Free (No Software Needed)
Add page numbers to any PDF online for free. Choose position, format, starting number, and skip the cover page. No software, no signup — works in your browser.
How to Extract Text from a Scanned PDF or Image (OCR Guide)
Extract text from scanned PDFs, screenshots, and photos for free using OCR. No software needed — works in your browser. Supports 100+ languages.
How to Compress a PDF for WhatsApp (Under 100MB Fast)
Compress any PDF to send on WhatsApp. Reduce file size under 100MB in seconds — free, no signup, no quality loss.
How to Make a PDF Smaller for Email Attachments
Reduce PDF file size to fit email attachment limits. Shrink PDFs under 25MB for Gmail, Outlook, and Yahoo — free, fast, no software.
How to Resize Photos for Passport and Visa Applications
Resize photos to exact passport and visa dimensions — 2x2, 35x45mm, 600x600px. Free browser tool with crop and aspect ratio control.
How to Convert HEIC to JPG (iPhone Photos for Windows)
Convert iPhone HEIC photos to JPG for free. Open HEIC files on Windows, upload to websites, or share with anyone — no software needed.
How to Create a QR Code for Your WiFi Password
Generate a WiFi QR code so guests connect instantly — no typing passwords. Free, no signup, works on any phone.
How to Convert PDF to JPG: Save PDF Pages as Images
Convert any PDF to high-quality JPG images for free. Extract every page as a separate image — no software, no signup, 100% browser-based.
How to Convert Word to PDF: Keep Your Formatting Perfect
Convert Word documents to PDF for free while preserving fonts, layout, and images. Step-by-step guide — no software needed.
How to Unlock a PDF: Remove Password Protection Easily
Remove password protection from any PDF for free. Unlock your own password-protected files in seconds — no software, no signup.
How to Compress Images Without Losing Quality
Reduce image file sizes by up to 80% without visible quality loss. Compress JPG, PNG, and WebP images for free — works in your browser.
How to Generate a QR Code for Free (Complete Guide)
Create custom QR codes for URLs, text, WiFi, and more — free, no signup, no watermarks. Works directly in your browser.
How to Password Protect a PDF for Free (Step-by-Step Guide)
Learn how to add password protection to any PDF file for free using PDFFlare. Encrypt your documents in seconds — no software, no signup, 100% private.
How to Resize an Image Without Losing Quality
Resize for Instagram, YouTube, passport photos, and more. Built-in presets, inline crop for off-aspect sources, and a single-click Crop & Resize flow.
PNG vs JPG vs WebP: Which Image Format Should You Use?
Compare PNG, JPG, and WebP image formats. Learn when to use each one for websites, social media, printing, and more. Includes a conversion tool.
How to Rotate a PDF: Fix Sideways and Upside-Down Pages
Fix sideways or upside-down PDF pages in seconds. Rotate individual pages or the entire document — free, browser-based, no software needed.
How to Remove Pages from a PDF (Without Losing Quality)
Delete unwanted pages from any PDF file for free. Remove blank pages, cover sheets, or confidential sections — no software, no quality loss.
How to Edit a PDF in Your Browser (No Software Needed)
Add text, shapes, highlights, and signatures directly to any PDF — right in your browser. No Adobe Acrobat, no signup, and your files never leave your device.
How to Convert PDF to Word While Preserving Formatting
Turn PDF documents into editable Word files without losing fonts, layout, or images. Learn the tricks that keep your formatting intact during conversion.
How to Split a PDF: Extract Pages in Seconds
Break a large PDF into smaller documents or pull out specific pages. This step-by-step guide covers every way to split a PDF quickly and for free.
How to Merge PDF Files Online for Free
Learn how to combine multiple PDF documents into a single file in seconds. No software to install, no signup required — just drag, drop, and merge.
5 Ways to Compress a PDF Without Losing Quality
Large PDF files slow down emails and eat up storage. Discover five proven methods to shrink your PDFs while keeping text sharp and images clear.
JPG to PDF: The Complete Guide to Converting Images
Whether you need to convert a single photo or batch-process an entire folder, this guide covers everything you need to know about turning JPG images into PDF documents.
How to Crop an Image Online for Free (Rotate, Batch & All Aspect Ratios)
Crop, rotate, and batch process images online for free. 10+ aspect ratio presets for Instagram, TikTok, YouTube — plus grid overlays, flip, and quality control.
How to Flip an Image Horizontally or Vertically (Mirror Guide)
Flip photos horizontally to fix mirrored selfies or vertically to rotate them upside-down. Free browser tool — supports JPG, PNG, and WebP.
How to Add a Watermark to Photos for Free (Protect Your Work)
Add text watermarks to photos to protect your work and build brand recognition. Choose position, opacity, and font — free, browser-based, batch-friendly.
How Many Words Is One Page? (Word Count Guide for Writers)
Find out how many words fit on a single-spaced or double-spaced page, and how long it takes to read. Includes a free online word counter tool.
How to Encode and Decode Base64 Online (Complete Guide)
Base64 encode and decode text, files, and images online for free. Learn when to use Base64, why encoded data is larger, and how to embed images in HTML.
What Is Lorem Ipsum? (And How to Generate It for Free)
Learn the history of Lorem Ipsum placeholder text, when to use it, and how to generate custom amounts for your design mockups — free, no signup.
How to URL Encode and Decode Online (Developer's Guide)
Encode and decode URLs for free to safely pass spaces, special characters, and Unicode in query strings. Includes encodeURI vs encodeURIComponent guide.
How to Generate MD5 and SHA-256 Hashes Online (Free Tool)
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes online for free. Verify file integrity, check download checksums, or test hash inputs — all in your browser.
How to Convert HEX to RGB Color Codes (Designer's Guide)
Convert between HEX, RGB, HSL, and HSV color codes instantly. Learn the difference between RGB and HSL, and when to use each for web and UI design.
How to Compare Two Texts Online (Free Text Diff Guide)
Spot differences between two versions of any document. Compare contracts, code, essays, or AI responses side-by-side with inline change highlighting.
How to Convert Markdown to HTML Online (Free Converter Guide)
Convert Markdown to clean, semantic HTML instantly. Supports headings, lists, links, images, code blocks, and GitHub Flavored Markdown — free, no signup.