Compress Image to 40 KB

Compress an image to 40 KB — enough detail for a clear ID photograph, light enough for a fast-loading page.

Supports JPEG, PNG, WebP, GIF, BMP and more — up to 50 MB

How to compress an image to 40 KB.

The target is preset, so this takes three steps — plus what to expect at 40 KB.

1
Step 1

Upload your image

Click upload or drag and drop any JPEG, PNG, WebP, SVG, or GIF file from your device.

2
Step 2

Target is already set to 40 KB

This page is preset to 40 KB, so there is nothing to type. Choose JPEG or WebP output for the most efficient result at this size.

3
Step 3

Compare, then download

Press compress and check the result against your original in the slider. Roughly 900 × 900 px is the realistic pixel budget at 40 KB — download when it looks right.

Getting the best results

Reuse one image at several display sizes carefully

A 40 KB image sized for a card will look soft if the same file is also used as a banner. Export a separate, larger version for the bigger slot rather than stretching this one.

WebP gets you more for the same 40 KB

At an identical target size, WebP holds noticeably more detail than JPEG. If the destination is a website you control rather than an upload form, choosing WebP output is free quality.

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Compressing an image to 40 KB.

What 40 KB is actually for, what it can hold, and how to get there without wasting quality.

What 40 KB is good for

40 KB buys a genuinely good identity photograph. At the dimensions application forms require, this is more budget than the image needs, which means the compressor spends it on quality rather than fighting the limit.

On the web, 40 KB is a useful ceiling for anything that appears more than once on a page. Card images, author avatars, and logo variants at this size add up slowly enough that they never dominate a page's total weight.

Where this size is required

Application photographs where the limit is 40 KB or a 20–50 KB range, repeated card imagery on a web page, author and profile photographs on a blog, and email newsletter images.

What to expect at 40 KB

Identity photographs look sharp with no visible compression. General photographs hold to roughly 900 × 900 pixels, which covers most in-page imagery short of a full-width hero.

Frequently asked questions.

Everything you need to know about compressing images to 40 KB.

No, it is a reasonable budget for one feature image. The thing to watch is the total: several 40 KB images plus tracking pixels and HTML can push a message toward the clipping threshold some mail clients apply.

Twice the data, which usually shows up as cleaner detail in hair, fabric texture, and gradients. On a small ID photograph the difference is subtle; at 800 pixels and above it is clearly visible.

A modern phone produces 3–6 MB per shot, so this is a reduction of roughly 99%. Almost all of that is resolution beyond what any screen or form needs.

The compressor targets 40 KB or just below, since forms enforce a ceiling rather than an exact figure. Landing slightly under is what you want for a limit.

Only if you keep PNG or WebP output. Choosing JPEG fills the transparent area with white, which is usually obvious once the logo sits on a coloured background.

For a photographic JPEG, roughly 900 × 900 px is the practical ceiling before compression becomes visible. Flat graphics, screenshots, and document scans do considerably better, because they contain less fine detail to preserve.

No. Images are processed on our secure server only to perform the compression and are deleted immediately after your download. They are never stored, shared, or accessed by anyone.