Recadrage d'Images

The most useful aspect ratios depend on the platform and placement. For Instagram feed posts, 1:1 (square) is the safest universal choice because it fills the most vertical space on mobile without triggering crop warnings. Portrait posts at 4:5 take up even more feed real estate and consistently outperform square in impression-per-post studies. Instagram Stories and Reels require 9:16 vertical framing — anything wider gets letterboxed with blurred edges. Twitter/X in-feed images render best at 16:9; the header banner uses 3:1. LinkedIn personal posts perform well at 1.91:1, which matches the Open Graph preview ratio exactly, so link-preview cards look crisp. Facebook feed images support 1.91:1 to 4:5; 1:1 is the safe default. YouTube thumbnails and video previews are always 16:9 at a minimum of 1280×720 pixels — going below that makes the thumbnail appear blurry on Retina displays. Pinterest favors 2:3 vertical pins, with 1000×1500 px being the recommended file size. WikiPlus Image Cropper offers all of these as one-click ratio presets so you never have to do the math manually. Free-form pixel cropping is also available for non-standard placements such as banner ads or email headers. Cropping to the exact platform ratio before upload prevents the platform's automatic re-crop, which routinely cuts off faces, logos, and critical text near the edges. Always double-check the final crop on a mobile preview before scheduling a post.

Cropping itself is geometrically lossless — the tool removes the pixels that fall outside your selected region but does not touch, re-encode, or recompress the pixels that remain inside the crop box. The Canvas API reads the source pixels and writes only the cropped subset to a new canvas, preserving the original bit depth and color values exactly. Quality loss becomes possible only at the export step, when the cropped canvas is encoded into a file format. If you export as PNG, the result is lossless regardless of the source format, because PNG uses a lossless deflate codec. If you export as JPEG, a quality setting between 90 and 100 is visually indistinguishable from the source at normal viewing distances; dropping below 80 introduces visible blocking artifacts in smooth gradients and skin tones. WikiPlus Image Cropper defaults to JPEG quality 92, which is the same target used by Google's Lighthouse tool and most professional photo-sharing platforms. The original color profile (sRGB, Display P3, or Adobe RGB) and EXIF orientation metadata are both preserved through the export. For RAW photography workflows where sub-pixel accuracy matters, always do the final crop in a RAW-aware editor like Lightroom or Darktable, then export once. For web publishing, social media, and e-commerce listings, browser-side cropping at quality 92 is fully adequate. Practical tip: export as PNG when cropping logos, screenshots, or graphics with flat colors — you get lossless precision without the file-size penalty that JPEGs impose on non-photographic content.

Yes. WikiPlus Image Cropper supports batch cropping of up to 50 images in a single session. Drop an entire folder of images into the upload zone — Chrome, Edge, and Firefox on desktop all support directory drag-and-drop. Once loaded, the aspect-ratio preset or custom pixel size you choose applies uniformly to every image in the batch. This is particularly useful for e-commerce product photography where every listing image must conform to the same 1:1 square at 800×800 pixels, or for social-media teams that need an entire campaign's photos cropped to 4:5 before scheduling. Each image is cropped independently in the browser using the Canvas API, so no image data is ever uploaded to a server — the entire batch processes locally on your device. The crop box can be repositioned per image if you need to center the subject differently in each frame; use the manual mode for that and cycle through images one at a time. If all images share a consistent composition — product on a white background, headshots centered at the same framing — the fixed-ratio auto-crop mode handles all 50 in a single click. Batch output is packed into a ZIP archive for one-click download, with each file named after the original filename plus the target dimensions. On a modern laptop, 50 full-resolution JPEG images crop and compress in under 15 seconds. Tip: name your source files with a numeric suffix (photo-001.jpg, photo-002.jpg) so the ZIP archive unpacks in the correct sequence.

Yes. The WikiPlus Image Cropper fully preserves the alpha channel through every step of the crop operation. When the source image is a PNG or WebP file with transparent pixels, the Canvas API reads the full RGBA data — red, green, blue, and alpha per pixel — and the cropped output retains the exact transparency mask of the original region. Semi-transparent edges, soft drop shadows, and anti-aliased logo outlines all survive the crop without any fringing or background bleed. The output format determines whether transparency is ultimately preserved in the saved file: exporting as PNG keeps the alpha channel intact and losslessly, while exporting as WebP also retains transparency. If you export as JPEG, the alpha channel is composited against a background fill color — white by default, but you can choose any color from the options panel — because the JPEG specification has no alpha channel support at all. For UI assets, icons, app store screenshots with rounded corners, product cut-outs, and marketing graphics where clean transparent backgrounds are essential, always export as PNG or WebP. The tool also respects the source file's embedded color profile so sRGB, Display P3, and Adobe RGB images render at their correct colors in the crop preview and in the downloaded file. Tip: when preparing transparent PNGs for use in Figma, Sketch, or Adobe XD, enable the "strip EXIF" option to remove camera metadata that design tools sometimes misinterpret as rotation instructions.