Compress Image to 300KB Online
Last reviewed: May 2026
300 KB is the cap that government photo portals settle on — UPSC's OTR photo upper bound, the Philippines DFA passport limit, and most embassy visa-photo ceilings. It's also a Shopify product-photo and Substack hero sweet spot. Sukat hits 300 KB precisely. Drop image, type 300, download.
How to compress an image to 300 KB
- Upload your image. Drop a JPG, PNG, WebP, HEIC, AVIF, or GIF onto Sukat. iPhone HEIC works directly.
- Set 300 KB as the limit. Type
300in Maximum File Size and select KB. Pick JPEG for government portals (UPSC, most embassy uploads) or WebP for the web. - Convert and download. Click Convert & Download. Sukat finds the highest quality that fits.
When do you need a 300 KB image?
300 KB sits at the upper end of "fast-loading web image" and is the most common ceiling on government photo-upload portals:
- UPSC OTR photographs — the 20–300 KB range. Many candidates aim for the upper end (250–300 KB) to preserve facial detail. See UPSC Photo & Signature Compressor for the full UPSC workflow.
- Philippines DFA passport photos — the official ceiling is under 300 KB. See Passport Photo Compressor.
- Embassy visa photo uploads — most embassies accept up to 300 KB for the candidate photograph.
- Shopify product photography — 300 KB is a common balance between quality and page speed.
- Substack and Medium hero images — 300 KB renders sharply on retina displays without slowing post load.
- SBI / IBPS document upload portals for supporting docs (not the candidate photo, which is tighter).
- WordPress page-speed audits — 300 KB is the hard ceiling Lighthouse will flag for inline content images.
Why Sukat for 300 KB
Hits 300 KB on the first pass. Government portals enforce hard ceilings — overshoot by 20 KB and you bounce off the upload widget. Sukat's binary search lands you precisely under 300.
Dimensions stay full. 300 KB comfortably holds a 1500–1800 pixel WebP or JPEG at quality 85–90, which is visually indistinguishable from the original. Sukat reduces quality before touching dimensions.
HEIC input, JPG output. If your photo is from an iPhone and the destination requires JPG, Sukat does the conversion in the same step.
Privacy. Compression runs in your browser. Your images never reach a server.
FAQ
What is 300 KB used for?
300 KB is the upper limit for UPSC OTR photographs (the 20–300 KB range), the typical Philippines DFA passport ceiling, and a common cap on embassy visa uploads. It's also a popular Shopify product-photo target and a Substack post header sweet spot.
Will my photo look excellent at 300 KB?
Yes. 300 KB comfortably holds a 1500–1800 pixel WebP or JPEG at quality 85–90, which is visually indistinguishable from the original. This is the high end of fast page-load images and the ceiling that most government portals settle on.
Why pick 300 KB instead of 200 KB or 500 KB?
300 KB is the right choice when 200 KB is too tight (you can see compression on busy backgrounds) but 500 KB is heavier than the portal accepts. Most government photo-upload portals settle around 300 KB.
Should I pick JPEG or WebP for 300 KB?
For government portals (UPSC, Philippines DFA, embassy visa uploads), pick JPEG — they explicitly require JPG. For web publishing, pick WebP — 25–35% sharper than JPEG at the same target.
Can I batch-compress many images to 300 KB?
Yes. Drop several images, set 300 KB as the target, and Sukat compresses each independently. Output downloads as separate files or as a single ZIP.
Is my image uploaded to a server?
No. Compression runs entirely in your browser via the Canvas API. Your images never reach a server. Verify by switching to airplane mode after the page loads.
Other sizes
- Compress Image to 200KB — neighbour, web-performance sweet spot
- Compress Image to 500KB — neighbour, portfolio-quality target
- Compress Image to 150KB — neighbour, blog and CMS thumbnails
- UPSC Photo & Signature Compressor — full UPSC OTR workflow at 20–300 KB
- Passport Photo Compressor — country-by-country passport photo targets
- Reduce Image Size in KB — pick any custom KB target
- Image Size Guide — full breakdown by platform and use case