About ZumaTools

ZumaTools is a collection of free, single-purpose tools for everyday tasks: preparing an image for a form, working with a PDF, checking a calculation, cleaning up text or taking a break with a game. Each tool does one job on its own page, and you can use them without creating an account.

Why the tools run locally

The file editors and converters process the files you select on your device. For example, an image is decoded and resized by your browser, while PDF operations use code downloaded with the page. These tools do not need to send your document to a processing server.

A few jobs, such as some video conversions, are too heavy for a browser. A tool that handles them on our server says so on its page before you choose a file, and the uploaded file is deleted automatically afterwards. The privacy policy explains what is uploaded and how long it is kept.

Local processing has limits. A large PDF or video can take time and use a considerable amount of memory. Some tools set explicit file-size, page-count or format limits to keep the browser responsive. The controls and explanations on the relevant page describe those limits; a result is not guaranteed for every file or device.

Some features use outside services. The pages load advertising and analytics scripts, although the files you process locally are not sent to them. YouTube thumbnails load from YouTube, and an online text-to-speech voice can send text to your browser's speech provider. Saved notes, preferences and some game progress remain in browser storage. Our privacy policy explains these cases, advertising and analytics, and the outage reports sent from the service status page.

Who runs it

ZumaTools is built and published by Novpix LLC, a small software company registered in Delaware, United States (131 Continental Dr, Suite 305, Newark, DE 19713). The same team makes CardPetal (animated e-cards), OrigamiDiagrams (step-by-step folding guides) and SeismoAtlas (earthquake data). You can reach us at support@zumatools.com; the contact page says what to include in a report.

How the tools are checked

Tools that change files have automated tests that run them in a real browser, the way a visitor would, and inspect the result: that a compressed image or PDF really lands under the size it promises, that a merged or split PDF keeps every page, that a passport photo has the required dimensions, that a converted HEIC opens. Page layouts are checked on phone-sized and desktop screens, and the built site is scanned for broken links and duplicate addresses.

Explanations are written for the specific tool, and limits are stated rather than hidden: where a tool cannot guarantee a result — a target size that a file cannot reach, a format a browser cannot read — the page says so. Our content and corrections policy explains how examples, sources and update dates are handled.

How it is paid for

The tools are free to use. Advertising is intended to support the cost of running and maintaining the site. An advertisement is separate from a tool's controls and is not a recommendation to buy the advertised product. You do not need to click an ad to use a tool or download its result.

Understanding a result

Different tools make different trade-offs. Compressing a JPEG can discard image detail; shrinking its pixel dimensions also changes its print size. A PDF made from page images may look right while losing searchable text. A calculator can apply a formula correctly while its assumptions do not match your situation. Read the explanation alongside the tool and inspect the output before replacing an original file or submitting a result.

Pages using tax rates, document specifications or other reference data can include source links and a reference date. Check those sources for requirements that may have changed. A page's update date records a content change; it does not certify that every external requirement is still current.

None of it is legal, financial or tax advice. The calculators apply the figures you give them; for anything you are filing or relying on, confirm the numbers with the relevant authority.

Corrections and improvements

A useful explanation should tell you what to enter, what the result means, and when a different approach is needed. If a page misses an important limitation or gives an incorrect example, send its URL and the expected result through our contact page. For a calculation, a small example with non-sensitive values is more useful than a screenshot of a private document. The changelog provides a record of changes from the project history.

Read our content and corrections policy for how to interpret examples, sources and update dates.

What is here

• Compress — Make images and documents smaller — by quality, or to an exact size limit.
• Resize — Exact pixel dimensions, including every platform's profile and banner size.
• Image converters — JPG, PNG and WebP in every direction, with the trade-offs spelled out.
• Image editing — Crop, rotate, censor, add text, remove backgrounds — without an account.
• PDF — Merge, split, rotate, compress to an exact size, convert to and from images.
• Calculators — Percentages, loans, dates, tax, statistics — with the working shown.
• Text — Count, compare, clean, convert case and strip formatting.
• Developer — Encode, decode, format, hash and inspect — the everyday utilities.
• Generators — QR codes, barcodes, passwords, placeholder data and more.
• Converters — Units, measurements and number systems, converted precisely.
• Time & date — Timers, countdowns, date arithmetic and timestamp conversion.
• Color — Pick, convert, extract palettes and check contrast.
• Fun — Text effects, generators, tests and small games.
• More — Everything that does not fit a category — and often the most useful.

Getting in touch

Bug reports, corrections and suggestions for new tools are all welcome — the contact page has our address. Include your browser and operating system so a problem can be reproduced on a similar device.