Fast, private developer tools
Convert CSV, merge PDFs, format JSON — every tool runs in your browser. Nothing is uploaded, and nothing is stored.
Most-used tools
- csvPivot
Pivot your CSV: choose row and column fields plus an aggregate (count, sum, average, min, max) to summarize data in one table.
- csvRename Headers
Rename CSV columns in one shot with an old=new mapping (one per line), keeping unmapped headers unchanged.
- csvShuffle Rows
Randomize the order of CSV rows using a seeded shuffle — the same seed reproduces the same order for A/B tests and sampling.
- csvSample
Pull a random sample of N rows from a large CSV (seeded for reproducibility) — great for spot-checking data before processing.
- csvCSV → vCard
Turn a name/email/phone CSV into standard vCard 3.0 blocks you can import into contacts apps — fully offline.
- csvCSV → iCal
Turn title/start/end CSV rows into a standard .ics calendar file you can import into Google Calendar, Outlook, or Apple Calendar.
Categories
- CSV Tools33 ready
Fast, private browser-based tools for working with CSV files.
- JSON Tools33 ready
Validate, format, and convert JSON instantly in your browser.
- PDF Tools8 ready
Merge, split, reorder, and convert PDFs without uploading them.
- Image Tools25 ready
Compress, convert, crop, and edit images privately in your browser.
- Text Tools25 ready
Format, transform, and analyze text quickly.
- YAML Tools26 ready
Validate, format, and convert YAML config files in your browser.
- Date & Time Tools26 ready
Convert timestamps, calculate date differences, and work with timezones.
- Units & Numbers Tools26 ready
Convert units and work with numbers — length, weight, temperature, and more.
- Security & Crypto Tools37 ready
Hashes, checksums, UUIDs, passwords, and tokens — generated locally.
- Generators16 ready
Generate QR codes, barcodes, passwords, and placeholder data instantly.
- Markdown Tools17 ready
Format, convert, and validate Markdown — tables, TOCs, badges, and more.
- Web & Networking Tools14 ready
IP lookup, DNS tools, URL parsers, and HTTP utilities — all in your browser.
- Color & Design Tools13 ready
Convert color formats, generate palettes, CSS gradients, and test accessibility.
- Encoding & Number Bases12 ready
Base64, hex, binary, Morse code, and character encoding converters.
- Finance & Business Tools15 ready
Loan calculators, interest, tax, ROI, and business math — client-side.
- SEO & Web Content Tools12 ready
Meta tag checkers, JSON-LD generators, UTM builders, and more.
- Math & Statistics Tools12 ready
Scientific calculator, prime numbers, matrices, statistics, and more.
- Geo & Location Tools10 ready
Coordinate converters, distance calculators, validators, and lookups.
- Regex & Pattern Tools11 ready
Test, explain, generate, and optimize regular expressions.
- Audio & Video Tools27 ready
Trim, convert, and edit audio and video files — processed entirely in your browser.
- Archive & Compression Tools22 ready
Zip, unzip, split, and inspect archives and files — nothing leaves your browser.
- Code Formatter Tools24 ready
Format, minify and inspect HTML, CSS, SQL, JavaScript and more — right in your browser.
- Git & Dev Utility Tools24 ready
Generate .gitignore and CODEOWNERS files, lint commits, read diffs and handle everyday Git chores — in your browser.
- XML Tools26 ready
Format, validate, query and convert XML documents — in your browser, with nothing uploaded.
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Frequently asked questions
Is DataToolsLab free?
Yes — every tool is free to use, with no signup or account required.
Are my files uploaded to a server?
No. Every tool processes your files locally in your browser. We do not see or store your data.
Do the tools work offline?
Yes. After you visit a tool page once, the service worker keeps it available offline.
Can I bookmark or favorite a tool?
Use the star icon on any tool page to add it to your favorites. Your list is stored locally and never leaves your device.