About CometBits

Why we built CometBits

Anyone who has filled in an online form knows the frustration: “Photo must be between 20 KB and 50 KB”, and your phone photo is 3 MB. We built CometBits so fixing a file takes seconds instead of a search through cluttered websites full of upload queues, watermarks and sign-up walls.

How it works

Unlike most online file tools, CometBits does not upload your files. Your browser does all the work on your own device. That means:

• Your photos, signatures and documents are never sent to a server.
• There is nothing to install and no account to create.
• It is fast, because there is no upload or download queue.
• It keeps working on a slow connection once the page has loaded.

What you can do

• Images: resize to an exact size in KB or pixels, compress, crop, rotate, convert between JPG, PNG and WebP, remove backgrounds, add watermarks, make passport photos and print sheets.
• PDF: merge, split, compress to a target size, sign, protect, unlock, redact, number pages, and convert to and from Word, Excel, PowerPoint and images.
• Audio and video: trim and convert audio, compress and cut video, make GIFs, record your screen.
• Utilities: ZIP files, QR codes, checksums, word counting and JSON formatting.

See every tool on the tools page, or read our guides for practical help.

Available in your language

CometBits is available in English, Spanish, Hindi, French, German, Portuguese and Indonesian, and more languages are on the way.

How the site pays for itself

CometBits is free to use. We may show a small number of advertisements to cover the cost of running the site. We keep them away from the buttons you use, and we never sell your files, because we never receive them.

Accuracy

Exam and visa requirements change often. We update the numbers on our pages when we can, but the official notice always has the final say. You can always type your own sizes into the tools.

Get in touch

Questions or suggestions? Visit the contact page.