Free Online Tool
Social Media Image Resizer
Every platform enforces different image dimensions, Instagram squares are 1080×1080, YouTube thumbnails are 1280×720, and LinkedIn banners are 1128×191. Drop your image once, select the sizes you need, and download all of them in a ZIP. No account, no upload, no waiting for a server.
Covers Instagram (4 sizes), YouTube (2), LinkedIn (3), Facebook (4), Twitter/X (3), and OG/SEO meta images (2), 18 preset sizes in total.
Your image never leaves your device. All resizing runs in your browser using the same Web Canvas and WebAssembly technology that powers professional desktop tools.
When not to use this tool
You need to upscale a small image
Resizing downscales cleanly but cannot invent detail. Upscaling a 400×400 photo to 1080×1080 looks soft. Use an AI upscaler for that case.
Single-platform exact crops
If you only target one platform, dedicated tools (Instagram Resizer, LinkedIn Banner Resizer) skip the platform menu and get you to the result faster.
Vector source files
SVG and Figma exports look crisper if you re-export from the source app at the target dimensions rather than rasterising and resizing.
Technical details
Contain vs Cover fitting
Contain (default) fits the whole image within the target dimensions, letterboxing with white if aspect ratios don't match. Best for product shots and logos where the full subject must stay visible. Cover scales the image to fill the target, cropping the overflowing edges. Best for hero banners and social posts where edge cropping is acceptable.
Output format choice
JPG: smaller files, no transparency, best for photos. PNG: lossless, supports transparency, larger files, best for logos with sharp edges. WebP (where supported by the platform): 30% smaller than JPG at the same quality, preferred for sites you control, less so for upload-to-Instagram workflows that re-encode anyway.
Resampling quality
OmegaPix uses high-quality bilinear/bicubic downsampling via Canvas2D. The browser's native resampler in 2026 is good enough that the difference versus Photoshop is imperceptible for typical web sizes. For pixel-perfect upsampling of pixel art, a separate tool is needed; for everything else, the in-browser path is fine.
Platform re-encoding
Most social platforms re-encode whatever you upload. Instagram and Facebook re-compress to ~80% JPEG quality on upload. LinkedIn drops to ~70% for non-premium accounts. Uploading at the exact target dimensions minimises re-encoding artefacts; uploading larger means the platform has to resample, which adds a second lossy step.
Real numbers
A 4032×3024 iPhone JPEG (~3 MB source) resized to Instagram square 1080×1080 produces ~150-300 KB JPG. Same source resized to Facebook cover 851×315 (cropped) ≈ 80-150 KB. YouTube thumbnail 1280×720 ≈ 200-400 KB. Each platform variant exports in under a second per size on a modern laptop.
Frequently Asked Questions
- What image formats are supported as input?
- You can drop JPG, PNG, WebP, AVIF, and HEIC (iPhone) files. GIF, BMP, and TIFF are also accepted. All decoding happens in your browser, nothing uploads.
- What format are the output files?
- JPG by default. It is the smallest format and accepted everywhere. Switch to PNG in the sidebar if you need transparency preserved (logos, graphics with transparent backgrounds). The active format is shown in each output card.
- Can I resize one image for multiple platforms at once?
- Yes. Tick any combination of sizes across all platforms and click Resize. Each size is processed in parallel and appears as a separate download card. Use "Download All" to grab them as a single ZIP.
- What crop modes are available?
- Contain (default) fits your entire image within the target dimensions and pads any remaining space with white, nothing is cropped. Cover scales the image to fill the target and center-trims the excess, which works best when your subject is centered. Stretch forces the exact dimensions and may distort the image; use it only when you know the aspect ratio already matches.
- Will my image lose quality?
- Output JPGs are encoded at quality 85, which is visually indistinguishable from higher settings at social media display sizes. This keeps file sizes small without any perceptible quality loss.
- Is there a file size limit?
- Source files up to 50 MB are supported. Processing a large file across many presets simultaneously requires browser memory, if you hit a memory warning, try selecting fewer sizes at once.
- Does this work on mobile?
- Yes. The tool works on modern Android and iOS browsers. Drop or tap to choose an image, tick your presets, and download. The interface adapts to portrait screens.
- Do I need to create an account?
- No account, no sign-up, no email. Open the page, resize your image, download it. That is the entire workflow.