Free Online Tools for Developers & Creators

Olutil stands for Online Utilities — a growing suite of privacy-first, browser-native web tools. Explore our specialized tool suites for JSON, time, PDF and image processing. Everything runs entirely in your browser, so your data never leaves your device. 100% Local Processing

JSON Tools

Format, validate, minify, convert, diff and query JSON with 41+ developer utilities.

Time Tools

Convert Unix timestamps, calculate date differences, switch timezones and more with 52+ clock tools.

PDF Tools

Merge, split, compress, rotate, sign and convert PDFs with 16+ document tools.

Image Tools

Resize, compress, convert, crop and edit images with 32+ browser-based image utilities.

Plant Tools

Plan watering, spacing, soil mix and frost dates with 22+ plant and garden tools.

Pet Tools

Convert dog and cat ages, estimate calories, feeding and costs with 28+ pet tools.

Teach Tools

Create worksheets, flashcards, quizzes and classroom games with 31+ teaching tools.

Cook Tools

Convert volumes and temperatures, scale recipes and estimate nutrition with 30+ cooking tools.

Baby Tools

Estimate due dates, track growth, sleep and feeding with 39+ baby and pregnancy tools.

DIY Tools

Estimate paint, tile, flooring, concrete and more with 16 home renovation calculators.

Game Tools

Create bingo cards, mazes, word searches, quizzes and more with 12 printable party game tools.

Finance Tools

Estimate mortgages, loans, compound interest, taxes, savings and more with 21 finance calculators.

Auto Tools

Estimate fuel economy, car loans, ownership costs, tyres, EV range and more with 15 car tools.

Home Tools

Split rent and bills, plan a mortgage down payment, a renovation budget and more with 15 housing tools.

Career Tools

Build a resume, write a cover letter, practise interviews, plan salary and track applications with 10 career tools.

Wedding Tools

Plan a wedding budget, guest list, seating, invitations, on-the-day timeline, favours and honeymoon with 16 tools that never upload your data.

Travel Tools

Plan a trip with a packing list, budget, itinerary, visa checklist, currency, tips and a countdown — 12 tools that never upload your data.

Plan Tools

Plan habits, tasks, weeks, months, goals, budgets, meals, workouts, reading, travel and projects — 12 planning tools that never upload your data.

Health Tools

Estimate BMI, BMR, TDEE, body fat, macros, hydration, sleep, one-rep max, pace, heart rate zones, pregnancy and baby growth with 15 tools that never upload your data.

Dev Tools

Format JSON, SQL, YAML and XML, decode JWTs, test regex, diff text, encode Base64 and URLs, hash, parse cron, generate .gitignore, Dockerfile, UUIDs and QR codes — 20 tools that never upload your code or data.

Legal Tools

Generate NDAs, leases, employment contracts, privacy policies, terms of service, disclaimers, powers of attorney and will templates — 8 general-purpose template generators that never upload your details.

Craft Tools

Estimate yarn, knitting sizes, fabric, material ratios, bead counts, paper cutting, resin and clay amounts, plus pricing and budgeting for handmade projects — 12 craft calculators that never upload your data.

How It Works

Olutil is a collection of focused sub-sites, each dedicated to one file or data type. Pick a suite above, open any tool, and work directly in your browser — nothing is uploaded to a server.

Runs 100% in your browser — no uploads, no server dependencies
Fast performance, even with large files
No sign-up, no accounts, no tracking pixels
Works on desktop, tablet and mobile devices

Frequently Asked Questions

Is my data safe?

Yes. All processing runs locally in your browser. Your data is not uploaded to any server. You can even use the tools offline once a page is loaded.

Do I need to install anything?

No. Every tool works directly in your web browser using JavaScript. No plugins, extensions or software installation required.

Is Olutil free to use?

Yes. All tool suites are completely free with no usage limits, watermarks or registration. Olutil is supported by advertising so it can stay free for everyone.