Image Resizer.

Upload your image to HQCalc's Image Resizer, enter your target width and height (or pick a social media preset), choose your output format (WEBP recommended), set quality, and click Resize. The file downloads instantly — no account needed.

Scaling up (enlarging) always reduces quality because new pixels must be interpolated. Scaling down generally preserves visual quality well. HQCalc uses a step-down algorithm for large reductions to minimise quality loss — a common technique used by professional tools.

WEBP offers the best balance of quality and file size for web use — typically 25–35% smaller than JPEG at the same quality. AVIF is the newest standard with even better compression but lower browser support. Use PNG for images requiring transparency or lossless quality. JPEG remains best for photos shared on older platforms.

WEBP is an image format developed by Google that uses advanced compression to achieve smaller file sizes than JPEG and PNG while maintaining comparable visual quality. It supports transparency (like PNG) and animation (like GIF). All modern browsers support WEBP, making it the recommended format for web images.

AVIF (AV1 Image File Format) is the newest image format, offering superior compression to WEBP — often 40–50% smaller than JPEG. It supports HDR, wide colour gamut, and transparency. Browser support is growing (Chrome, Firefox, Safari support it), making it excellent for modern web projects.

Use the Social Presets mode in HQCalc. Instagram post (square) is 1080×1080px. Instagram portrait is 1080×1350px. Instagram Stories and Reels are 1080×1920px. Instagram landscape is 1080×566px. Select the preset and click resize — the tool handles the cropping automatically.

Key 2026 social media image sizes: Instagram Post 1080×1080px, Instagram Story 1080×1920px, Twitter/X Post 1200×675px, Facebook Post 1200×630px, LinkedIn Post 1200×627px, YouTube Thumbnail 1280×720px, Pinterest Pin 1000×1500px. All presets are built into HQCalc.

Use HQCalc's Compress Only mode with WEBP or AVIF format at 80–85 quality. This re-encodes the image with modern compression algorithms, typically reducing file size by 40–60% with no perceptible quality difference at standard viewing sizes.

Completely safe. HQCalc's Image Resizer operates 100% in your browser using the HTML5 Canvas API. Your images are never uploaded to any server, never stored, and never transmitted anywhere. The entire resize/compress process happens on your device.

Yes. Select PNG as your output format to preserve the alpha channel (transparency). If you select JPEG, transparency will be replaced with a white background since JPEG does not support alpha channels. WEBP also supports transparency.

When you lock the aspect ratio (the padlock icon in Custom mode), changing the width automatically updates the height (and vice versa) to maintain the original proportions. This prevents distortion. Unlock it to set independent width and height values (stretching/squishing the image).

Use Compress Only mode with WEBP format at 75–85 quality for a drastic file size reduction. Alternatively, resize the image to smaller dimensions (fewer pixels = smaller file). Combining both — smaller dimensions AND WEBP format — gives the smallest possible output.

When resizing an image to less than 50% of its original size, standard single-step interpolation can produce blurry or jagged results. The step-down algorithm repeatedly halves the image until near the target size, then makes a final resize. This produces much sharper results — the same technique used by Photoshop's bicubic sharper option.

Thumbnail mode centre-crops the image to a perfect square (removing excess height or width) then scales it to your specified size. This is ideal for product images, avatars, and social media profile pictures where a specific square format is required.

HQCalc accepts GIF, BMP, SVG, JPG, PNG, WEBP, and AVIF as input formats (any format the browser can decode). Note that animated GIFs will be converted to a static frame. SVG is rasterised at the browser's rendered size.

For most web images, 80–85 quality with WEBP is the sweet spot — excellent visual quality with a 40–60% file size reduction vs original. For social media sharing where quality is critical, use 90+. For aggressive compression (email attachments, slow connections), 60–70 is acceptable. PNG quality is always lossless and the setting is ignored.

There is no hard server-side limit since processing happens in your browser. Practical limits depend on your device's RAM and browser. Most modern devices handle images up to 20–30MB and 10,000×10,000px without issues. Very large RAW files or extremely high-resolution images may be slow to process.

Resizing scales the entire image to new dimensions — the full image is retained but made larger or smaller. Cropping cuts away portions of the image to achieve a specific aspect ratio or composition, and may then resize the remaining area. HQCalc's Crop mode lets you choose a ratio (1:1, 16:9, etc.) and centre-crops automatically.

Yes. HQCalc's Image Resizer is fully mobile-optimised and works on any modern smartphone browser (Chrome, Safari, Firefox). The in-browser Canvas API is supported on all current mobile operating systems.

Never. HQCalc is completely free with no watermarks, no account required, and no limitations. Your resized images are entirely yours.