Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
Split PDF pages into separate documents directly in your browser. Your files never leave your device.
Drop PDF file here
or click to browse
Maximum file size: 50MB
A PDF splitter lets you divide a PDF document into multiple smaller PDF files. You can split by a fixed number of pages per file, define custom page ranges, or extract specific pages into a single document.
This tool runs entirely in your browser using the pdf-lib library. Your files never leave your device — they are not uploaded to any server.
Yes. All processing happens in your browser using JavaScript. Your PDF is never uploaded to any server, stored, or logged.
Every N Pages splits the document into parts with a fixed number of pages each. Custom Ranges lets you define exact page ranges like "1-3, 5, 7-9". Extract Pages collects specific pages into a single PDF.
The tool supports PDF files up to 50MB. For large files, processing time depends on your device's performance.
In Custom Ranges mode, enter ranges separated by commas. For example, "1-3" creates a PDF with pages 1, 2, and 3. A single number like "5" creates a PDF with just page 5. The ranges are processed in order.
Related Tools
Blog
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
A practical decision guide to choosing the right hash algorithm: MD5, SHA-1, SHA-2, SHA-3, bcrypt, argon2, PBKDF2, and SRI, with comparisons and clear recommendations.
Aug 08, 2026
A thorough, practical comparison of hand-written CSS and Tailwind CSS: learning curve, maintainability, performance, team workflows, and when each approach wins.
Aug 08, 2026
Learn practical, step-by-step techniques to improve LCP, INP, and CLS on your website. A developer-focused guide with real measurements and fixes.
Aug 08, 2026
Learn practical, production-ready ways to use Base64 encoding: data URLs for images, JWT payloads, API tokens, and email attachments, with real code examples.
Aug 08, 2026
Learn how AES encryption works, the differences between AES-128, AES-192, and AES-256, and how to encrypt and decrypt data online.
Jun 23, 2026