Compress Image to 100kB

Strictly speaking they do not all pick 100 kB – the notices we checked use windows such as 10–100 kB (JEE Main and NEET signatures), 20–100 kB (UPSC CAPF signature) and 50–100 kB (the IBPS and SBI declaration) – but 100 kB is the ceiling they share. The reasoning is practical. A signature or a passport-style photo at 600 × 800 px fits inside 100 kB with quality to spare, so nothing useful is lost. Multiply a few files by millions of applicants and the storage and bandwidth savings are large. Most applicants upload from phones on weak connections, where a 100 kB file goes through first time. And a round number is easy for a form to check and easy for you to remember.

Yes. A 5 MB file from a phone is usually a 12–24 megapixel picture, and 100 kB cannot hold that many pixels at any quality worth having, so the tool does two things. It first searches the JPEG quality scale for a setting that fits; when that would mean dropping below roughly 45 %, it reduces the dimensions in clean steps and searches again. A 4000 × 3000 px original typically comes back at about 1200 × 900 px, a few kB under the target, with the exact byte count printed in the result panel. If the form only needs your face, crop to head and shoulders first – a 600 × 800 px crop keeps far more quality at 100 kB than a shrunken whole scene.

Work backwards from the pixels. JPEG photos on the web average about 2 bits per pixel (HTTP Archive, 2024), so 100 kB holds roughly 400,000 pixels at ordinary quality: 800 × 500 px for a landscape or 630 × 630 px for a square. A passport-style portrait on a plain background needs fewer bits per pixel, so 600 × 800 px fits with headroom, and a signature or handwritten declaration on white paper fits at 800 × 400 px with room to spare. Everyday photos sit best at 1000–1200 px on the long side. Going much past 1500 px forces the quality down to where skin and sky look blotchy, while going below about 400 px wastes the budget on a picture that looks soft on screen.

Type 80. The tool lands at or just under whatever figure you enter, so 80 kB gives a result that is comfortably above the 50 kB floor and well below the 100 kB ceiling, even on a portal that counts 1,024 bytes to the kB. Two things to watch. First, if your scan is already smaller than 50 kB the tool will tell you it is small enough and hand back the original; the fix is to rescan in colour at 200 dpi so the file starts bigger, then compress. Second, use exact 800 × 400 px in the resize box when the notice gives pixel dimensions, as the IBPS and SBI declaration does, so the size check and the dimension check both pass.

JPG, almost without exception. Every exam and recruitment notice in the table above names JPG or JPEG and nothing else, so a PNG or WebP is likely to be rejected at the upload step even when it is small enough. WebP is the better compressor – Google's figures put lossy WebP 25–34 % lighter than JPEG at the same quality – but that only helps on your own website. PNG is lossless, so the tool can only bring one under 100 kB by shrinking its dimensions, which is rarely what you want for a photo. Pick JPG in the output menu, and if your source is a transparent PNG the tool fills the transparent area with white as it saves.

No installation is needed. Mb2KbSizer is a web page, so it works the moment it loads in current Chrome, Edge, Firefox, Safari or Samsung Internet on a phone, tablet or computer. Nothing is downloaded to your device except the page itself, and it does not ask for storage or camera permissions. If you use the tool often, you can add it to your phone's home screen from the browser menu and it will open like an app. It still needs an internet connection to load, though, so treat this as a shortcut rather than an offline program. There is no Play Store or App Store version.

Three steps, usually under a minute.

1. Add your photo. Drag it onto the upload box, tap browse to pick it from your gallery, or paste it from the clipboard with Ctrl/Cmd + V.
2. Set the target. Type a number and choose kB or MB, or tap a quick chip from 20 to 350 kB. On a preset page the field is already filled in. If a form demands exact pixel dimensions, set them in the resize option.
3. Press Compress, then Download. You get a before/after slider, the output dimensions, the quality used and the exact byte count, so you know it will pass before you submit it.

You can upload JPG, PNG, WebP, GIF (the first frame is used), BMP and AVIF, provided your browser can decode the file. HEIC photos from an iPhone open in Safari and other browsers with HEIC support; elsewhere the tool explains how to set the camera to Most Compatible so new shots are saved as JPG. Files up to 60 MB are accepted. For output, Auto gives a JPG in most cases and keeps WebP as WebP; you can also force JPG, WebP or PNG. PNG is lossless, so a PNG target is reached only by reducing dimensions, which is why JPG is the better pick for a small photo.

Strictly speaking, you never upload anything. When you choose a file, the browser reads it from your device and does the resizing and re-encoding in a background worker on that same device. No copy travels to our server or to anyone else's; the only thing our server sends you is the page. A useful side effect is that the browser rebuilds the image from its pixels alone, so EXIF data such as the camera model, the date taken and the GPS location is dropped from the output. That makes the compressed photo safer to share than the original you started with.

No. We have no image storage of any kind, because the file never reaches us in the first place. It sits in your browser's memory while you work, and the compressed version exists only on your device once you download it. Close or refresh the tab and both are gone. We keep no history, no gallery and no cache on our side, and we cannot see what you compress. Our web host records ordinary server logs, such as the time of a page visit and the browser used, but those cannot contain your pictures. For the full detail, read our privacy policy.

Mb2KbSizer is a free image and PDF compressor that runs inside your web browser. You pick a file, type the size you need, such as 100 kB, and it shrinks the file to land at or just under that number. Most people use it for upload forms that reject big files: exam registrations, passport and visa applications, job portals, bank KYC and college admissions. It is just as handy for lightening photos before you email them or put them on a website. There is a [single-image tool](/), a bulk compressor for up to 200 photos at once, and a PDF compressor, all built on the same no-upload principle.

Yes. Every tool on this site is free, and we intend to keep it that way. There is no sign-up, no premium tier, no daily quota and no watermark on the output. Compress one photo or three hundred; nothing counts against a limit. A few ads on the page pay for hosting. Because the heavy lifting happens on your own device rather than on our servers, each extra user costs us almost nothing, so there is no reason to charge. We do not sell an app, a plan or an API either, so you will never be nudged towards a paid version.