# Compress image to 300 KB > Reduce any photo or image to 300 KB or less for large web images that still load fast. Works with JPG, PNG, WebP, HEIC, GIF and AVIF; most formats never leave your browser. Free, no sign-up. URL: https://www.converterrr.com/compress-image-to-300kb Shrink any photo or image to 300 KB or less for large web images that still load fast. JPG, PNG, WebP and HEIC and more. Accepted formats: JPG, PNG, WebP, AVIF, GIF, HEIC, TIFF. API: `POST /api/v1/jobs` with `"operation": "compress", "target_size": "300kb"` (paid plans). ## How to compress an image to 300 KB 1. **Add your images.** Drop JPG, PNG, WebP or HEIC files onto the compressor above, paste them, or click to browse. Mixed formats are fine. 2. **300 KB is preset.** Every file is compressed to land at or just under 300 KB. You can switch to another size, or a percentage to reduce by. 3. **Compress.** Click Compress. Each image keeps its format and, for most formats, never leaves your browser. 4. **Check and download.** Check the new sizes, 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 photo comes out around 1,660 × 1,110 px as a JPG, or 1,900 × 1,260 px (2 MP) as a WebP. Each file keeps its own format. - 300 KB here means 300,000 bytes, so the result also fits forms that count 1 KB as 1,024 bytes. - Everything except HEIC is compressed in your browser, so nothing is uploaded; HEIC runs in an isolated cloud sandbox and is deleted automatically. ## Which format keeps the most at 300 KB The same 300 KB holds a different amount of detail depending on the format. Rough size of a detailed 3:2 photo at good quality: | Format | A photo fits roughly | Good to know | | --- | --- | --- | | JPG | ≈ 1,660 × 1,110 px | Accepted almost everywhere; the safe pick for forms | | WebP | ≈ 1,900 × 1,260 px (2 MP) | More detail than JPG, if the site accepts WebP | | HEIC | ≈ 2,060 × 1,370 px (3 MP) | iPhone photos; many forms don't accept it | | AVIF | ≈ 2,120 × 1,410 px (3 MP) | Most efficient, least widely accepted | | PNG | ≈ 850 × 570 px | Best for logos, screenshots and signatures, not photos | _Rough guide for detailed photos. Each file keeps its own format; convert first if the destination needs a specific one._ ## 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. ## Photo won't fit in 300 KB? - **Crop before you compress.** Every pixel you crop away is budget the subject keeps. For an ID photo, crop to head and shoulders first; for a document, crop to the page. - **Photo saved as PNG? Make it a JPG.** At 300 KB, a photo stored as PNG only fits around 850 × 570 px; as a JPG it fits around 1,660 × 1,110 px. [Convert PNG to JPG](https://www.converterrr.com/png-to-jpg). - **Form won't take HEIC?.** iPhone photos are HEIC by default, and many upload forms reject it. Convert to JPG first, then compress to 300 KB. [Convert HEIC to JPG](https://www.converterrr.com/heic-to-jpg). ## Other image sizes - [Compress image to 100 KB](https://www.converterrr.com/compress-image-to-100kb): 100 KB upload limits - [Compress image to 200 KB](https://www.converterrr.com/compress-image-to-200kb): Web images & listings - [Compress image to 500 KB](https://www.converterrr.com/compress-image-to-500kb): Hero images & forms - [Compress image to 1 MB](https://www.converterrr.com/compress-image-to-1mb): Email & portal uploads ## 300 KB for a specific format [Compress JPG to 300 KB](https://www.converterrr.com/compress-jpg-to-300kb), [Compress PNG to 300 KB](https://www.converterrr.com/compress-png-to-300kb), [Compress GIF to 300 KB](https://www.converterrr.com/compress-gif-to-300kb) ## Compress image to 300 KB: frequently asked questions ### How do I compress an image to 300 KB? Drop the image onto the compressor above. 300 KB is already set as the target (you can switch to another size or a percentage), so click Compress and download the result. ### Which image formats can I compress to 300 KB? JPG, PNG, WebP, AVIF, GIF, HEIC and TIFF. Each file keeps its own format. SVG is compressed losslessly, so it can't be aimed at a size. ### Which format keeps the most quality at 300 KB? WebP, HEIC and AVIF keep more detail than JPG at the same size, roughly 1,900 × 1,260 px (2 MP) for WebP against 1,660 × 1,110 px for JPG. But forms usually ask for JPG, so check what the site accepts. PNG is the worst choice for photos at small sizes. ### Will my image be resized to fit 300 KB? 300 KB leaves room for a detailed photo at typical laptop-screen widths. At 300 KB, a detailed photo comes out around 1,660 × 1,110 px as a JPG, or 1,900 × 1,260 px (2 MP) as a WebP. Each file keeps its own format. ### What if my image won't fit in 300 KB? Crop before you compress: every pixel you crop away is budget the subject keeps. For an ID photo, crop to head and shoulders first; for a document, crop to the page. Photo saved as PNG? Make it a JPG: at 300 KB, a photo stored as PNG only fits around 850 × 570 px; as a JPG it fits around 1,660 × 1,110 px. Form won't take HEIC?: iPhone photos are HEIC by default, and many upload forms reject it. Convert to JPG first, then compress to 300 KB. ### 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. ### 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. ### Are my images uploaded? Everything except HEIC is compressed in your browser, so nothing is uploaded; HEIC runs in an isolated cloud sandbox and is deleted automatically.