# Compress JPG to 300 KB > Compress a JPG photo to 300 KB or less for large web images that still load fast. Runs in your browser, so your files never leave your device. Free, no sign-up, no watermark. URL: https://www.converterrr.com/compress-jpg-to-300kb Shrink a JPG to 300 KB or less for large web images that still load fast. API: `POST /api/v1/jobs` with `"operation": "compress", "target_size": "300kb"` (paid plans). ## How to compress a JPG to 300 KB 1. **Add your JPG.** Drop one or more JPG files onto the compressor above, paste them, or click to browse. 2. **300 KB is preset.** The target is already set to 300 KB, and each file is compressed to land at or just under it. You can switch to another size or a percentage to reduce by. 3. **Compress.** Click Compress. The JPG is processed in your browser; nothing is uploaded. 4. **Check and download.** Check the new size, then download each file or all of them as a ZIP. ## Good to know - 300 KB leaves room for a detailed photo at typical laptop-screen widths. - At 300 KB, a detailed JPG photo comes out around 1,660 × 1,110 px at good quality; simpler images can stay larger. - 300 KB here means 300,000 bytes, so the result also fits forms that count 1 KB as 1,024 bytes. - JPG compression runs entirely in your browser with WebAssembly, so nothing is uploaded and your files never leave your device. ## What fits in 300 KB Roughly how large a detailed JPG photo can be at 300 KB. Simple images, like documents and graphics, can stay larger. | Image | Roughly fits | Quality | | --- | --- | --- | | Photo (3:2) | ≈ 1,660 × 1,110 px | Good | | Photo (3:2) | ≈ 2,240 × 1,500 px (3 MP) | Acceptable, some artefacts | | Square photo or avatar | ≈ 1,360 × 1,360 px | Good | _Rough guide for detailed photos. Real results depend on detail, noise and colour._ ## What 300 KB is typically for - Wide images in blog posts and landing pages - Portfolio and gallery pages - Upload forms with a 300 KB limit Limits vary by site and change over time; check the exact number where you're uploading. ## How JPG gets smaller Re-encodes with an optimised JPEG encoder at a tuned quality and strips bulky metadata. [Compress JPG by quality level instead](https://www.converterrr.com/compress-jpg) ## Neighbouring sizes - [Compress JPG to 100 KB](https://www.converterrr.com/compress-jpg-to-100kb): 100 KB upload limits - [Compress JPG to 200 KB](https://www.converterrr.com/compress-jpg-to-200kb): Web images & listings - [Compress JPG to 500 KB](https://www.converterrr.com/compress-jpg-to-500kb): Hero images & forms - [Compress JPG to 1 MB](https://www.converterrr.com/compress-jpg-to-1mb): Email & portal uploads Got a mix of formats? [Compress any image to 300 KB](https://www.converterrr.com/compress-image-to-300kb). ## JPG to 300 KB: frequently asked questions ### How do I compress a JPG to 300 KB? Drop the JPG onto the compressor above. The 300 KB target is already set, so just click Compress and download the result. ### Will the file be exactly 300 KB? It aims to land at or just under 300 KB. 300 KB here means 300,000 bytes, so it also fits sites that count 1 KB as 1,024 bytes. ### How much quality will I lose at 300 KB? 300 KB leaves room for a detailed photo at typical laptop-screen widths. At 300 KB, a detailed JPG photo comes out around 1,660 × 1,110 px at good quality; simpler images can stay larger. ### My JPG is already smaller than 300 KB. What now? Then it already fits, and compressing it further would only cost quality. Upload it as it is, or pick a smaller target if you need it smaller still. ### What if my JPG can't get down to 300 KB? Very large or detailed images are scaled down further to reach 300 KB. If the result is too small, pick a larger target. ### What is 300 KB typically needed for? Common reasons: wide images in blog posts and landing pages; portfolio and gallery pages; upload forms with a 300 KB limit. Limits vary by site, so check the exact number where you're uploading. ### Is my JPG private? Yes. It's compressed inside your browser and never uploaded.