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UnderByte
Compress images and PDFs to exact size limits
UnderByte compresses images and PDFs to the exact upload limit you need, like 20 KB, 200 KB, 500 KB, or 1 MB. Everything runs in your browser, so files stay on your device after the app loads. It handles JPG, PNG, WebP, and PDF, supports batch mode, and is built for real-world government, visa, job, and form-upload size limits.
I built UnderByte because I kept running into awful upload forms that reject files for being a few KB too large, especially for PDFs, passport photos, signatures, resumes, and government forms. Most compressors either upload your files, make you guess the quality settings, or don’t aim for an exact target size.
So I wanted something simpler: pick a file, set a limit like 200 KB or 1 MB, and get the smallest acceptable result without sending the file to a server. The whole point is speed, privacy, and less trial-and-error.
What makes UnderByte different is the “exact size limit” focus and the local-first approach. It supports JPG, PNG, WebP, and PDF, and batch mode is there for people who need to handle multiple uploads at once.
I’d love feedback on the UX, edge cases, and what upload workflows you run into most often.
About UnderByte on Product Hunt
“Compress images and PDFs to exact size limits”
UnderByte was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #77 on the daily leaderboard. UnderByte compresses images and PDFs to the exact upload limit you need, like 20 KB, 200 KB, 500 KB, or 1 MB. Everything runs in your browser, so files stay on your device after the app loads. It handles JPG, PNG, WebP, and PDF, supports batch mode, and is built for real-world government, visa, job, and form-upload size limits.
On the analytics side, UnderByte competes within Web App, Productivity and Developer Tools — topics that collectively have 1.3M followers on Product Hunt. The dashboard above tracks how UnderByte performed against the three products that launched closest to it on the same day.
Who hunted UnderByte?
UnderByte was hunted by Vince Prior. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of UnderByte including community comment highlights and product details, visit the product overview.
Vince Prior