Compress Image to 150 KB
150 KB shows up as a hard ceiling on a lot of document-upload screens. Set the target and the tool works out the quality for you.
Original
Compressed
Leave empty to use quality slider. We'll automatically find the best quality to hit your target size.
Compress an image to 150 KB without sending it anywhere
This page does one job: get your file to 150 KB or less. The target-size field is already set to 150, so you only have to pick a file. The compression runs inside your browser — nothing is uploaded and no account is needed.
Where the 150 KB limit comes from
Document upload screens on government and institutional portals commonly land on 100–200 KB, with 150 KB appearing as an explicit maximum. Some school and scholarship submission portals accept scanned pages only up to 150 KB each. Certain ticketing systems cap per-image payload at 150 KB to keep database blobs small.
Why the file keeps going over 150 KB
Multi-page scans saved as one giant PNG — that is both the wrong format and far too many pixels. Photographing a document at close range on a modern phone, producing a 12 MP file. Assuming the browser will shrink the file for you. It will not; upload limits are checked on the raw bytes.
Private by design
There is no upload step and no server round trip. The image is decoded, re-encoded and offered back to you as a download, all inside the page. That also means it keeps working when a locked-down portal or an inbox is the only thing you have access to.
What this page does — and what it does not
A 150 KB target is a narrow job. Here is exactly what is, and is not, on offer.
Hits an exact 150 KB target
The target is pre-filled. The tool searches quality until the file lands at or under 150 KB.
Nothing is uploaded
Decoding, re-encoding and download all happen inside the page. No server round trip, no account.
Keeps your pixel dimensions
Target-size mode only tunes compression quality. It will not shrink the image for you — resize first if the pixel count is the problem.
One image at a time
This is a single-file page. For a whole folder, use the Bulk Image Processor instead.
How to compress an image to 150 KB
Step 1
For scans, capture at a modest resolution — 1500–2000 px on the long edge is plenty for text.
Step 3
Upload here, leave the target at 150 KB, keep the output on JPG, and compress.
Step 4
Compare the before/after preview to confirm text is still readable before uploading to the portal.
Compressing to 150 KB in Detail
Note on mechanics: the tool re-encodes your file at up to eight JPEG/WebP quality levels between roughly 10% and 95% and keeps the smallest result that lands at or under 150 KB. It never changes pixel dimensions. For scanned pages at 150 KB the search generally lands mid-range, which is why text usually stays readable.
Where 150 KB shows up
This figure is common on document workflows rather than photo workflows: scanned pages, certificates, receipts and signed forms. It is large enough that a full page of text survives comfortably, and small enough that a batch of them does not stress a document store. If a form mentions both a dimension requirement and a 150 KB cap, the size is the binding constraint in practice.
Why text compresses well and photos do not
Text on a flat background has enormous redundancy — long runs of identical white pixels cost almost nothing after encoding. That is why a readable 1500 px scanned page fits comfortably in 150 KB while a 1500 px photograph of a forest struggles. When a limit feels unfair, it is usually because the content is photographic rather than textual.
Checklist for scanned documents at 150 KB
- Scan or capture at 1500–2000 px on the long edge; more is wasted on text.
- Output as JPG, not PNG — a scanned page as PNG can be ten times the size.
- Straighten and crop to the page edge so no dark background is encoded.
- Check the preview for legibility before submitting.
Keeping text readable as the size drops
Legibility falls off a cliff once character strokes start merging, and that happens later than most people expect: a 1500 px page at 150 KB is usually perfectly readable, while the same page at 40 KB may not be. If a portal also accepts a higher limit such as 200 KB, take it — the extra 50 KB goes entirely into stroke definition and costs nothing else.
Recommended Tools for Image Projects
Check these useful supplies to print and create your edited images.
Glossy Photo Paper
High-quality photo paper for printing your edited pictures.
Canon SELPHY CP1500
Wireless compact photo printer — print 4x6 photos from your phone.
Matte Inkjet Art Paper
Matte heavy-weight paper for art prints & graphic works.
SanDisk Extreme SSD 1TB
Rugged portable SSD — fast backup for photos, videos, and large files.
Etekcity 24" 5-in-1 Reflector
Ultra-lightweight 8oz reflector — easy to carry on location shoots.
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