Compress Image to 150 KB
Upload limit of 150 KB? Compress any image to exactly 150 KB or less with the highest quality that fits — locally in your browser, nothing sent anywhere.
Free, no signup, no watermark. If a target can’t be reached, we tell you exactly why and what to change.
How it works
Drop your image
Drag a JPG, PNG, or WebP into the tool — or browse, or paste it. The file opens directly in your browser and is never uploaded.
We hit 150 KB exactly
The engine searches for the highest quality that fits your limit, reducing dimensions only when the target demands it.
Check & download
A before/after preview shows you the quality. Download the result and pass that upload check.
Where the 150 KB limit appears
150 KB is a document-and-scan class limit:
- Scanned certificates and marksheets — admission and verification portals.
- ID document photos — front/back captures for KYC flows.
- Government file uploads — supporting documents on portals that allow “up to 150KB per file”.
- Profile photos — systems a notch more generous than the 100 KB class.
The practical question at 150 KB is usually “will the text on my scan stay readable?” — and the answer is yes, if the scan is cropped to the document. The engine preserves edges (text) preferentially because JPEG compresses smooth areas hardest.
How the compression works
The tool re-encodes your image and binary-searches the quality setting: try, measure the real output size, narrow in — until it finds the highest quality that fits your limit. If a very large photo can’t fit through quality alone, it steps the dimensions down gently and retries, and the result panel tells you when it did.
Targets in the 100–300 KB range are the sweet spot: a typical phone photo lands here at good visual quality with no visible artifacts at normal viewing sizes. One format note: PNG can’t be compressed to an exact KB size (it has no quality dial), so PNG input produces a JPG or WebP output — the tool tells you, and transparency becomes a white background.
The result panel reports four things every time: original size, final size, a quality verdict, and the output dimensions — so you know exactly what was done to your image before you upload it anywhere.
Before you upload — quick checks
Three habits that prevent re-dos when working against a size limit:
- Always compress from the original. Re-compressing an already-compressed JPG stacks quality loss. If round one missed the target, start over from the source photo rather than re-feeding the output.
- Leave a margin. Some systems count a kilobyte as 1000 bytes, not 1024, and a file scraping the ceiling can fail their check. The presets here already land safely under.
- Keep both files. Save the compressed version for uploads and the original for printing or editing later — storage is cheap, lost originals aren’t.
Privacy bonus: re-encoding strips hidden EXIF metadata — camera model, settings, and GPS location — so the file you upload carries the picture and nothing else.
Private by architecture, not by promise
Your files are processed entirely on your own device — they are never uploaded to us or anyone else. We couldn’t see them if we wanted to. This website is served from servers in the United States (North Carolina).
Processed on your device
The compression engine is JavaScript running in your browser. There is no upload step in the code — nothing to trust, just how it works.
No signup, no watermark
Every tool is free and works instantly. No account, no email required, no marks on your files.
Honest results
If your target size can’t be reached at acceptable quality, we say so and tell you exactly what to change — not silently degrade your file.
Frequently asked questions
Will text on my scanned document stay readable?
Yes, for a cropped A4 scan at typical dimensions. Crop away desk/background before compressing — wasted area spends kilobytes that should go to the text. If the result looks soft, scan at higher contrast and retry.
Scan as image or PDF — which is better for portals?
Whatever the portal asks for. If it accepts both, image (JPG) is simpler and this tool sizes it exactly. If it demands PDF, use our “JPG to PDF under 100KB” or “Compress PDF” tools instead.
Will the quality visibly suffer?
At this size range, almost never. The engine always picks the highest quality that fits, and the before/after preview lets you verify with your own eyes before downloading.
Do you store or even see my image?
Neither. Processing happens inside your browser on your device. The image is never transmitted — we couldn’t look at it even if we wanted to.
Should I pick JPG or WebP output?
JPG is universally accepted and the safe default. WebP packs the same quality into fewer kilobytes, so use it where you control the destination — your own website, for example.
Can I “undo” the compression later?
No — compression discards data permanently, which is why the tool never overwrites anything: you download a new file and your original stays untouched on your device. Keep the original as your master copy.