Custom Image Optimizer

Target KB is the most powerful feature of this tool. Enter the maximum file size you need the output to be — for example 200 for 200KB — and the optimizer automatically finds the right compression level to bring your image as close to that size as possible without going over. This is essential for uploading to portals with strict file size limits, such as government application systems, university admissions, job portals, and online forms that enforce a maximum upload size.

Quality sets the compression level on a scale of 1 to 100. The default is 85, which produces a very good balance between file size reduction and visual quality — most people cannot distinguish a quality-85 image from the original at normal viewing sizes. Lower values (40–70) produce smaller files with more compression artefacts. Values above 90 produce near-lossless output with minimal size reduction. You can combine Quality with Target KB — the optimizer uses the quality as a starting point and adjusts compression to hit the target size.

Resize % scales the pixel dimensions of your image by a percentage of the original. A value of 50 reduces both width and height to 50% — a 2000×1500px image becomes 1000×750px. A value of 75 scales to 75%, and a value of 150 enlarges by 50%. This is separate from compression — reducing dimensions physically reduces the number of pixels, which significantly reduces file size even at high quality settings. Use this when you need both smaller dimensions and smaller file size simultaneously.

Yes. All three settings are optional and combinable. A common workflow: set Resize % to 80 to bring dimensions down slightly, set Quality to 85 (or leave at default), and set Target KB to your required limit — the optimizer compresses the resized image to hit your target. You can also use just one or two settings — for example Quality alone for general compression, or Target KB alone if you only care about the final file size.

Common file size limits by platform: Government and visa application portals (typically 100–500 KB), university admissions systems (usually under 200 KB per document), job application portals and HR systems (100–500 KB), LinkedIn profile photo (300–800 KB is ideal), email attachments for reliable delivery (under 1 MB), website hero and product images for fast loading (under 200 KB), social media uploads (varies — under 5 MB for quality). Always check the specific portal's instructions for the exact limit, then enter that number in the Target KB field.

The optimizer compresses the image as far as technically possible while maintaining some level of visual content. If the target KB is extremely low relative to the image's complexity and dimensions — for example targeting 10 KB for a 4000px wide photograph — the result will be heavily compressed. For very aggressive targets, combine Target KB with Resize % to first reduce the pixel dimensions, which gives the compressor much more room to hit your size target with better quality.

All lossy compression involves some quality trade-off. The default quality of 85 produces output that is visually near-identical to the original for most images at normal viewing sizes. Quality settings above 85 produce virtually no visible degradation. Settings below 60 will show compression artefacts on close inspection, particularly in smooth gradients and high-detail areas. The target KB mode applies the minimum compression needed to hit your size limit — so it automatically preserves as much quality as possible within your constraint.

The tool accepts JPG, JPEG, PNG, WebP, BMP, TIFF, and GIF. The output format matches your original upload format. If you need to change formats while optimizing, use the Image Converter tool first, then optimize with this tool.

Yes — completely free with no usage limits and no watermark on the optimized output. Optimize as many images as you need at no cost with no account required.