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Compress any image to an exact KB — and prove it.

Hit a precise file-size target in KB or MB, set the exact width, height and format you need, and get an instant pass/fail compliance check. The all-in-one image compliance platform — no uploads, no accounts.

Compress an image Photo & ID presets

Drag & drop images, or browse

JPG · PNG · WebP · HEIC · HEIF — processed privately in your browser

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Format
Quick targets:

Your compressed images appear here. Nothing is uploaded — everything runs on your device.

The difference

One workflow for the whole requirement

Most tools make you compress in one place, resize in another, and convert in a third — then guess whether the result actually fits. FitToKB does it all at once and confirms it.

Exact-size targeting

Binary-search compression lands as close to your KB target as possible without ever exceeding it.

Size + dimensions + format

Set 20 KB, 200×230 px and JPG together. One click produces a file that satisfies every rule.

Compliance validator

See ✅ Meets requirement or ❌ with the exact rule that failed — no more rejected uploads.

Popular targets

Jump to a common file-size limit

Dedicated, optimised pages for the sizes people need most.

Compress to 20 KB Compress to 50 KB Compress to 100 KB Compress to 200 KB Compress to 500 KB Compress to 1 MB

Photo & ID compliance

Pass photo & signature rules first time

Pre-loaded presets for passport, visa, government-exam and signature uploads.

Passport photo Visa photo Exam form photo Signature image

The toolkit

Every image tool you need, in one place

Compress to Exact KB

Hit any target size + dimensions + format in one click, with a pass/fail check.

Open

PNG Compressor

Shrink PNG files in your browser, or convert to a smaller format.

Open

JPG Compressor

Reduce JPG/JPEG photos to an exact KB target without visible loss.

Open

HEIC to JPG

Convert iPhone HEIC/HEIF photos to JPG — and resize to a size limit.

Open

PNG to JPG

Convert PNG to JPG with a white background and optional size cap.

Open

JPG to WebP

Modern WebP output for the smallest files at the same quality.

Open

Passport Photo Maker

Generate a compliant passport or visa photo for any country.

Open

Signature Resize Tool

Resize a scanned signature to the exact px + KB an exam form wants.

Open

Photo Compliance Checker

Check any photo against a size + dimension + format requirement.

Open

Image Dimension Checker

Instantly see width, height, aspect ratio and file size — no upload.

Open

How it works

Three steps, about a minute

  1. 1

    Add your image

    Drag and drop or browse for a JPG, PNG, WebP, HEIC or HEIF file. It never leaves your device.

  2. 2

    Set your target

    Enter an exact size in KB or MB, and optionally the width, height and output format you need.

  3. 3

    Download the compliant file

    FitToKB hits your target without going over, shows a pass/fail check, and lets you download instantly.

Need a hand or spotted an error in a spec?

About & contact

Frequently asked questions

Is FitToKB really free with no signup?
Yes. Every feature is free, with no account, no watermark, no subscription and no upload limit. The tool is built to stay free for everyone.
Are my images uploaded to a server?
No. All compression, resizing and HEIC conversion happen entirely in your browser using the Canvas API. Your photos never leave your device, so they are private by design.
How does “compress to an exact KB” work?
FitToKB runs a binary search on the encoder quality (and downsizes the image if needed) to find the largest quality whose output stays at or below your target size — so the file is as close to your target as possible without exceeding it.
Which formats are supported?
You can compress and convert between JPG, PNG and WebP, and convert iPhone HEIC/HEIF photos to JPG — all in the browser.
Can I set the size, dimensions and format at the same time?
Yes — that is what makes FitToKB different. Set a target KB, exact pixel dimensions and a format together, click once, and the compliance validator confirms the result meets every requirement.

Compress your first image now

Free forever. No signup, no watermark, no upload. Everything runs on your device.

Open the compressor