Redimensionar Imagem

Yes. WikiPlus Image Resizer is completely free for personal, educational, and commercial use with no restrictions. There is no account registration required, no watermark added to output images, no file size cap, and no daily or monthly processing quota. You can use it to resize a single holiday photo before attaching it to an email, to batch-resize a full catalogue of product images for an ecommerce store, to prepare social media content for a paying client, or to generate platform-specific assets at scale for a marketing campaign. All of these use cases are permitted without any licence file, attribution notice, or fee. There is no tiered pricing model where commercial use requires a paid subscription — the tool is funded by the broader WikiPlus platform rather than by per-use charges. The output images are yours, unencumbered by any WikiPlus intellectual property claim. The tool adds no identifying metadata, no invisible watermark, and no embedded attribution to any file you download. This applies equally to single-image downloads and batch ZIP archives. The only limitation relevant to commercial use is the legal status of the source images themselves: if you are resizing an image you do not own the rights to, the resizing operation itself is not the source of infringement, but publishing the resized image may be. WikiPlus has no role in that determination — it applies to any tool you use to modify a third-party image, not specifically to this resizer.

Yes. WikiPlus Image Resizer supports three distinct input modes that you can switch between at any time before processing. Pixel mode lets you type in absolute target dimensions — for example, 1920 pixels wide for a desktop wallpaper, 800 pixels wide for a blog featured image, or 640 pixels wide for a mobile-optimised thumbnail. Percentage mode scales the image relative to its current dimensions by a factor you specify. Entering 50 halves the image in both dimensions. Entering 200 doubles it. Entering 75 produces an image three-quarters the original size. This is the fastest mode when you do not know the target pixel count but have a clear idea of the scale change needed, such as reducing all images in a batch to half resolution for a mobile variant. Aspect-ratio lock is enabled by default in both modes: changing the width automatically recalculates the height to maintain the original proportions, preventing accidental distortion. You can disable the lock to set width and height independently, which is useful when you need to fit an image into a fixed container that does not match the original aspect ratio, such as a banner template with a non-standard shape. A third mode allows you to specify the target dimensions in centimetres or inches at a chosen DPI setting, which is useful for preparing images destined for print rather than screen display. The tool shows the calculated output pixel dimensions before you commit, so you can verify the result is what you expect.

Yes. The WikiPlus Image Resizer processes all images entirely within your browser using the HTML5 Canvas 2D API. The complete pipeline — loading the source file, reading pixel data, applying the resampling algorithm, encoding the output — runs inside your browser tab without any outbound network request to WikiPlus servers or any third-party service. Your files are never uploaded, never cached remotely, never logged by filename or metadata, and never passed to analytics infrastructure. The local processing architecture is particularly important for the categories of images people most commonly need to resize: profile photos and personal portraits, identification document scans submitted with applications, medical record attachments for healthcare portals, screenshots of confidential internal systems, product design mockups under NDA, and legal evidence photographs. Any of these images processed through a server-side resizer reaches an external data centre where storage policies, employee access, breach risk, and regulatory jurisdiction all apply in ways you cannot audit or control. With WikiPlus, no such exposure exists because no server receives the file. This is verifiable by a simple practical test: load the page in your browser, wait for it to fully initialise, then disconnect your device from the internet — turn off Wi-Fi, enable airplane mode, or unplug Ethernet. Upload an image and resize it. The tool completes the operation and makes the resized file available for download, demonstrating that no server communication is required after the initial page load.

Yes. By default, WikiPlus Image Resizer preserves the input format in the output. A JPEG source produces a JPEG output. A PNG source produces a PNG output. A WebP source produces a WebP output. This format-preserving behaviour is intentional because changing format silently can break downstream workflows. A JPEG output from a JPEG source maintains the lossy compression characteristics appropriate for photographic content. A PNG output from a PNG source preserves lossless encoding and keeps any transparency data that the original contained. A WebP output from a WebP source maintains the efficient modern codec while keeping the resized dimensions. If you want to change the format at the same time as resizing — for example, converting JPEG to WebP to achieve a smaller file weight — the recommended workflow is to resize first using the Image Resizer and then convert the output using the WikiPlus Image Converter. Running in this order produces smaller final files than converting first and resizing second, because the converter encodes fewer pixels after the resize step. The Image Converter gives you full control over the output codec and a quality slider for fine-tuning the compression aggressiveness. JPEG quality at the resize step uses a high-quality default of 92 to prevent generational quality loss if you plan to edit the image again. For final web-delivery assets where file size matters, lower this in the converter step rather than at the resize stage.