Developer Tools

Format, validate, and encode JSON data, Base64 strings, and URLs directly in your browser without sending data to a server.

Free to useNo sign-up requiredWorks in your browserPrivacy focused

Format, validate and organise JSON data with a clear, readable result.

Convert text to and from standard Base64 or URL-safe Base64url with full support for international characters.

Check JSON for syntax errors with exact line and column pointers and one-click cleanup for comments and trailing commas.

Percent-encode special characters in URL parameters or decode encoded web addresses back into readable text.

Need to compress or convert images instead?

Reduce JPG, PNG, and WebP file sizes and resize dimensions directly in your browser.

Tips, tutorials and guides to help you get the best results.

Learn practical ways to shrink JPG, PNG, and WebP photos by choosing the right dimensions, quality settings, and image formats.

Compare JPG and WebP file sizes, image quality, transparency support, and compatibility across browsers and devices.

Understand how word counts, reading time, and character limits work for articles, social media posts, SEO descriptions, and text messages.

Learn how to spot and fix trailing commas, missing quotes, comments, and formatting issues in JSON files quickly.

Combine multiple PDFs in order, extract custom page ranges, fix sideways scanned pages permanently, and turn photos into printable PDFs.

Understand monthly loan amortization, extra principal payment savings, discount and tax math, working-day counts, and measurement conversions.

Choose between random passwords and memorable passphrases, design print-ready SVG QR codes, and structure focused Pomodoro sessions.