Free Developer Tools for Web, Code, and Images

FormatMint provides a suite of fast, free, and privacy-focused tools for developers. Format JSON, edit HTML, convert images, and more, all running locally in your browser.

19 tools available. No server-side processing for most tools.

Simple Online HTML Editor

Live HTML CSS JS editor with preview. Edit and test code instantly in your browser. No registration required.

html editorcss editorjavascript editor

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AI Text Enhancer

Improve and rewrite text using Groq AI models. Proofread, rewrite, and transform your content with AI.

ai textai rewriteproofread

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AI Regex Generator

Generate accurate regular expressions from text descriptions using AI. Powered by Groq.

regex generatorregex onlineai regex

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Responsive Design Checker

Preview how a website looks on mobile, tablet, laptop, Full HD and 4K displays.

responsive checkerviewport testermobile preview

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JSON Formatter & Validator

Format, validate, and minify JSON data instantly. Pretty print or compress JSON with error detection. Free online JSON tool.

json formatterjson validatorjson minify

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Text Diff Checker

Compare two text blocks side by side and find differences instantly. Perfect for code review and document comparison.

diff checkertext comparetext difference

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Word & Text Tools

Count words and characters, convert text case (uppercase, lowercase, title case), and remove extra spaces instantly.

word countcharacter counttext tools

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URL Encoder / Decoder

Encode or decode URLs and query strings. Convert special characters for safe URL transmission.

url encoderurl decoderencode url

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Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 strings. Perfect for data encoding and API integrations.

base64 encoderbase64 decoderencode base64

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Slug Generator

Generate SEO-friendly URL slugs from text. Perfect for blog posts, articles, and web pages.

slug generatorurl slugseo slug

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Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Supports multiple formats and timezones.

timestamp converterunix timestampepoch converter

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CSV ↔ JSON Converter

Convert CSV to JSON and JSON to CSV. Perfect for data transformation and API integrations.

csv to jsonjson to csvcsv converter

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Markdown Preview

Write Markdown and see live preview. Supports GitHub Flavored Markdown with syntax highlighting.

markdown previewmarkdown editormd preview

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QR Code Generator

Generate QR codes from text or URLs. Download as PNG image. Perfect for sharing links and contact info.

qr code generatorqr code makergenerate qr code

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Image → Base64 Converter

Convert images to Base64 strings. Perfect for embedding images in HTML, CSS, or JSON.

image to base64base64 imageimage encoder

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HTML Meta Tag Generator

Generate SEO meta tags for your website. Includes Open Graph, Twitter Cards, and standard meta tags.

meta tag generatorseo meta tagsopen graph

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Image Compressor

Compress images to reduce file size while maintaining quality. Client-side compression for privacy.

image compressorcompress imagesreduce image size

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Image to PDF Converter

Convert images to PDF format. Combine multiple images into a single PDF document. Client-side conversion.

image to pdfconvert image to pdfjpg to pdf

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Image Resizer

Resize images to custom dimensions or percentages. Maintain aspect ratio or set custom width and height.

image resizerresize imageimage dimensions

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