Everyday conversions. Zero uploads.

Image Format Converter — Convert between JPG, PNG, WebP, GIF, and BMP formats. Simply drag and drop your image, select the target format, and download instantly. Perfect for converting screenshots (PNG) to compressed JPG for email, or creating WebP files for faster website loading.

Image Resizer — Resize any image to custom dimensions or use presets like 1920×1080, 1280×720, 800×600, 400×400, or 150×150. Great for social media profile photos, thumbnails, or fitting images to specific size requirements.

Image Compressor — Reduce image file sizes with adjustable quality (1-100%). Supports JPEG, WebP, and PNG output. See a live before/after comparison showing exactly how much space you saved — savings depend on the source format and selected quality.

Markdown to HTML Converter — Write or paste Markdown and get instant HTML output. Supports headings, bold, italic, code blocks, lists, blockquotes, and links. Toggle between HTML source view and rendered preview. Download the result as an .html file.

HTML to Plain Text — Strip all HTML tags from any markup and extract clean, readable plain text. Paste messy HTML from emails or web pages and get clean text output you can use anywhere.

CSV ↔ JSON Converter — Convert CSV spreadsheet data to structured JSON arrays, or convert JSON back to CSV format. Handles headers automatically. Essential for developers working with APIs, databases, or data migration.

JSON Formatter & Validator — Pretty-print, minify, or validate JSON data. Instantly tells you if your JSON is valid or shows exactly where the syntax error is. Formats with proper indentation for readability or compresses to a single line for production.

Base64 Encode/Decode — Encode any text or file to Base64, or decode Base64 strings back to readable text. Supports both text input and file drag-and-drop. Essential for embedding images in CSS, working with APIs, or handling email attachments.

URL Encode/Decode — Encode special characters in URLs to percent-encoded format, or decode encoded URLs back to readable text. Critical for web development, API work, and debugging query strings.

HTML Entity Encode/Decode — Convert special characters like <, >, &, and quotes to their HTML entity equivalents, or decode entities back. Useful when representing special characters as HTML text; other HTML contexts require their own safeguards.

JWT Decoder — Paste any JSON Web Token to instantly decode its header, payload, and check expiration status. See the algorithm, claims, issuer, and whether its expiration claim has passed (the signature is not verified) — all without sending it to any server.

Word & Character Counter — Count words, characters, sentences, and estimated reading time as you type. Writers, students, and content creators use this to meet word count requirements for essays, articles, and social media posts.

Case Converter — Transform text between UPPERCASE, lowercase, Title Case, camelCase, and snake_case. One click to convert — perfect for formatting code variable names, headlines, or standardizing text.

Lorem Ipsum Generator — Generate placeholder text for design mockups and wireframes. Choose 1-50 paragraphs of properly randomized Latin text. Copy to clipboard with one click.

Text Diff Checker — Compare two texts side by side and see exactly which lines differ. Additions highlighted in green, removals in red. Perfect for comparing code versions, document revisions, or configuration changes.

Color Converter — Convert colors between HEX, RGB, and HSL formats with a live color preview. Type in any format and all others update in real time. Essential for designers and front-end developers working across different CSS color specifications.

Color Palette from Image — Upload any image to automatically extract its dominant color palette. Returns up to 12 colors with HEX codes you can copy with one click. Great for creating brand palettes inspired by photography or artwork.

WCAG Contrast Checker — Check if your foreground and background color combination meets WCAG accessibility standards. Tests against AA Normal (4.5:1), AA Large (3:1), and AAA Normal (7:1) ratios with live preview.

PDF Merge — Combine multiple PDF files into a single document. Upload your PDFs, drag and drop to reorder them, then merge with one click. All processing happens in your browser using pdf-lib — your files are never uploaded to any server.

PDF Split — Split a PDF into separate files by page range, every N pages, or extract specific individual pages. Download each split file separately or grab them all at once as a ZIP archive.

PDF Compress — Reduce your PDF file size with three compression levels: Low (best quality), Medium (balanced), and High (smallest file). See a before-and-after comparison showing exactly how much space you saved.

PDF to Image — Convert each page of a PDF to high-quality PNG or JPEG images. Choose your preferred DPI/scale and JPEG quality. Download individual page images or all pages as a ZIP archive. Uses Mozilla's pdf.js for accurate rendering.

Image to PDF — Convert one or more images (JPG, PNG, WebP) into a PDF document. Supports drag-and-drop reordering, A4/Letter/Fit-to-Image page sizes, and portrait/landscape/auto orientation. Each image is centered on its page.

File Hash Calculator — Calculate MD5, SHA-1, SHA-256, and SHA-512 hashes for any file. Drag and drop a file, and all four hashes are computed instantly in your browser. Copy any hash with one click, or paste a known hash to verify it matches. Uses the Web Crypto API for SHA hashes and SparkMD5 for MD5.

Data Storage Converter — Convert between bytes, kilobytes (KB), megabytes (MB), gigabytes (GB), terabytes (TB), and petabytes (PB). Uses binary (1024-based) units; some operating systems and drive makers instead use decimal (1000-based) units. Instantly answer questions like "how many GB in a TB?" or "how many MB is 4.7 GB?" — essential for developers, IT professionals, and anyone managing storage.

QR Code Generator — Generate QR codes for URLs, plain text, WiFi network credentials, email addresses, and phone numbers. Customize size, foreground color, and background color. Download as PNG or SVG. Works offline after the toolbox reports that offline tools are ready.

Is ConvertFree really free?

Yes, 100% free. All 40 tools work without payment or sign-up. Some tools limit batch size to keep processing manageable. One reserved display banner on a substantial tool page can support the service without blocking the converter.

Are my files safe and private?

Absolutely. All conversions happen directly in your web browser using JavaScript. Your files are never uploaded to any server. Downloaded files remain on your device. Tool history and preferences may remain in browser storage; conversion inputs and file contents are not sent to our analytics.

What file formats are supported?

Images: JPG, PNG, WebP, GIF, BMP. PDFs: merge, split, compress, convert to images, images to PDF. Documents: Markdown, HTML, CSV, JSON. Developer formats: Base64, URL encoding, HTML entities, JWT tokens. Plus text tools, color converters, and file hash calculator.

Is there a file size limit?

Since everything processes in your browser, limits depend on your device's memory. Large files, complex PDFs, or high-resolution images may exceed your browser’s memory. Use smaller files if processing fails; individual tools may set additional limits.

Do I need to install anything?

No. ConvertFree works entirely in your web browser — Chrome, Firefox, Safari, Edge, or any modern browser. No downloads, extensions, or plugins needed. It even works on mobile.

How is this different from other online converters?

Most online converters upload your files to their servers — meaning your data passes through unknown third parties. ConvertFree processes everything locally in your browser. Core tools work offline after the application shell is ready; the larger HEIC and AVIF decoders become available offline after their first successful online use.