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Free online tools for developers, designers, students and everyday tasks. Format code, convert files, work with PDFs and images, calculate values, generate data and more — with no account required.
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JSON Formatter
Format and beautify JSON into clean, readable output in one click.
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CSV to JSON
Convert CSV files to JSON in your browser — fast, free and private.
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Base64 Encode
Base64 Encode — a free encoding tool in the Tools4U Developer Tools collection.
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JWT Decoder
Decode JWT safely in your browser — nothing is uploaded.
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UUID Generator
Generate UUID instantly with sensible, copy-ready defaults.
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Find frequently used tools quickly and bookmark the ones you use most.
JSON Formatter
Format and beautify JSON into clean, readable output in one click.
CSV to JSON
Convert CSV files to JSON in your browser — fast, free and private.
Base64 Encode
Base64 Encode — a free encoding tool in the Tools4U Developer Tools collection.
JWT Decoder
Decode JWT safely in your browser — nothing is uploaded.
UUID Generator
Generate UUID instantly with sensible, copy-ready defaults.
Regex Tester
Test Regex against real samples and see matches highlighted live.
Image Compressor
Reduce Image file size with almost no visible quality loss.
PDF Merge
PDF Merge — a free basic tool in the Tools4U PDF Tools collection.
Categories
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Browse tools by category and find the right utility quickly. From developer and text tools to image, PDF, calculator and data utilities, everything is organised for easy access.
Developer Tools
JSON, encoding, hashing, regex, SQL and everyday developer utilities.
BrowseImage Tools
Compress, convert, resize and edit images without uploading them.
BrowsePDF Tools
Merge, split, convert, protect and edit PDF documents.
BrowseDocuments
Word, Excel, CSV and everyday document conversion helpers.
BrowseYouTube Tools
Titles, tags, thumbnails, transcripts and channel analysis.
BrowseText Tools
Counters, case converters, cleaners, generators and comparisons.
BrowseAI Tools
Writing, coding, document and video assistants.
BrowseCalculators & Converters
Finance, health, units, currency and everyday maths.
BrowseJust added
New tools
Fresh utilities shipped this month.
JSON Tree Viewer
Open and explore JSON Tree in a readable, collapsible view.
Favicon Generator
Generate Favicon instantly with sensible, copy-ready defaults.
Token Counter
Count tokens live as you type, with a full breakdown.
Mock Data Generator
Generate Mock Data instantly with sensible, copy-ready defaults.
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