Free Online Developer Tools for Programmers

19 tools live · All free · No signup · Runs in your browser

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PDF Tools

Convert code, Markdown, and HTML to professional PDFs.

Code to PDF

Convert source code to PDF with syntax highlighting. Supports Python, JavaScript, Java, Go, Rust, and 45+ more languages. Free online code to PDF converter, no signup required.

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Markdown to PDF

Convert Markdown documents to professionally styled PDFs. Preserves headings, code blocks, tables, and lists. Free online Markdown to PDF converter, no account required.

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HTML to PDF

Convert HTML with CSS to a pixel-accurate PDF online. Supports flexbox, tables, Google Fonts, and custom styles. Free online HTML to PDF converter, no signup required.

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Formatters

Beautify and format JSON, SQL, HTML, CSS, XML, and YAML.

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JSON Formatter

Format, beautify, and indent JSON online instantly. Validates JSON syntax and highlights errors. Free online JSON formatter and beautifier, no account required.

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JSON Validator

Validate JSON syntax instantly online. Pinpoints the exact line and column of every error. Free online JSON validator and syntax checker, no signup required.

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JSON Compare

Compare two JSON objects side-by-side online. Highlights added, removed, and changed keys with full dot-notation paths. Free online JSON diff tool, no signup required.

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SQL Formatter

Format and beautify SQL queries online. Supports MySQL, PostgreSQL, SQLite, T-SQL, and BigQuery. Clean indented output instantly. Free SQL formatter, no account needed.

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HTML Formatter

Format and indent HTML markup online for better readability. Beautifies minified HTML instantly with configurable indentation. Free HTML formatter, no signup required.

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CSS Formatter

Format and expand minified CSS stylesheets online. Consistent indentation, readable property formatting. Free CSS formatter and beautifier, no account required.

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XML Formatter

Format and indent XML documents online. Validates structure and reports errors. Supports attributes, namespaces, and large files. Free XML formatter, no signup needed.

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YAML Formatter

Format YAML and convert between YAML and JSON online. Supports Kubernetes configs, CI/CD pipelines, and Ansible playbooks. Free YAML formatter, no signup required.

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Encoders & Decoders

Encode and decode Base64, JWT, URL, and more.

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Base64 Encode

Encode any text or data to Base64 format instantly in your browser. Supports standard and URL-safe Base64. Free online Base64 encoder, no account needed.

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Base64 Decode

Decode Base64-encoded strings back to plain text instantly. Handles standard and URL-safe Base64 with error detection. Free online Base64 decoder, no account needed.

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JWT Decoder

Decode and inspect JWT tokens online. View header, payload, expiry, and all claims. Decode-only — nothing sent to server. Free JWT decoder, no signup required.

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Generators

Generate UUIDs, QR codes, passwords, and other data.

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UUID Generator

Generate cryptographically secure v4 UUIDs online. Bulk generate up to 100 at a time with one click. Free UUID generator — runs in browser, no account needed.

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QR Code Generator

Generate QR codes for any URL, text, or data. Download as PNG or SVG. Customise size, colours, and error correction. Free online QR code generator, no signup needed.

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Utilities

Regex testing, timestamp conversion, and other essentials.