Free online calculators & tools
Everything runs in your browser — no sign-up, nothing uploaded.
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No sign-up · Local processing · Free
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Generate a direct WhatsApp link with the phone number and message you want, plus a QR code to print or share, for free.
🔒 LocalReduce the size of one or more JPG, PNG or WebP images down to the KB you need, or adjust the quality manually.
🔒 LocalCombine several PDF files into one, in the order you choose, without uploading them to any server.
🔒 LocalConvert iPhone HEIC/HEIF photos to JPG, WebP or a single PDF.
🔒 LocalCompare two texts line by line, word by word or character by character.
🔒 LocalFormat, validate and minify JSON, with clear error messages that point to exactly where it broke.
🔒 LocalGenerate random passwords or a memorable multi-word passphrase, with crypto.getRandomValues.
🔒 LocalGenerate a QR code for a URL, text, email, phone, SMS, or a contact (vCard), with adjustable size and error correction.
🔒 LocalConvert a number or an amount in euros, pesos or dollars into its written English form, with cents and check/invoice formatting.
🔒 LocalConvert Markdown to HTML instantly, with a safe preview included.
🔒 LocalCompare two CSV or Excel files and detect added, removed and modified rows by key column.
🔒 LocalOpen and browse an Excel file (XLSX/XLS) or CSV directly in your browser, nothing to install.
🔒 LocalPlace 2, 4, 6, 8 or 9 pages of a PDF on each sheet, ready to print while saving paper.
🔒 LocalType your options, spin the wheel, and let chance decide — with a visual animation and confetti.
🔒 LocalExplore by category
Merge, split, organize, compress and edit PDF files — all processed in your browser.
17 tools
Compress, resize, crop and convert images — all processed in your browser.
18 tools
Compare, count, clean up and transform text — all processed in your browser.
15 tools
JSON, YAML, XML, Base64, JWT, regex and more quick dev utilities — all processed in your browser.
46 tools
Read, validate and convert common documents and data — all processed in your browser.
9 tools
Work calendars, official holidays and vacation optimization — all processed in your browser.
1 tool
Love, friendship, numerology, tarot and zodiac — entertainment and tradition tools, all processed in your browser.
14 tools
Spinning wheel, random pickers, teams, dice and more — decide randomly in a fun, visual way, all in your browser.
8 tools
Generate professional documents — work reports, quotations and more — with a live preview and a high-quality PDF, all in your browser.
1 tool
Money, housing, self-employment, car and more — solve a real number with your own inputs.
166 calculators
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Create professional work reports with company, customer, materials, labor, photos and signature — download the PDF, all in your browser.
🔒 LocalCalculate how old you'd be on Mercury, Venus, Mars, Jupiter, Saturn, Uranus or Neptune, based on their real orbital period.
🔒 LocalChart your physical, emotional and intellectual cycles with the traditional biorhythm model, from your birth date to today.
🔒 LocalDiscover the traditional birthstone and birth flower for your birth month, with their color and symbolic meaning.
🔒 LocalCalculate your moon sign from the real astronomical position of the Moon at the moment you were born.
🔒 LocalCalculate how long you've been together, your next anniversary, and the day milestones of your relationship.
🔒 LocalFree, no accounts
No calculator or tool asks you to sign up to use it.
Local processing
Numelto has no backend or database: nothing you do is sent to any server.
Works great on mobile
Just as good on your phone as on a computer.
Always growing
New calculators and tools, continuously.