View and extract rendered previews from Sketch (.sketch) design files on Windows, Linux, or mobile with no Mac and no Sketch licence. Sketch saves a full page render inside every document — convrtr pulls it out bit-exact in your browser with nothing uploaded.
Detailed side-by-side format architecture for SKETCH Graphic Raster (.sketch) and Portable Network Graphics (.png). Every conversion executes strictly within isolated browser memory without network transit.
Drag and drop your .sketch file onto the working surface or use the system file dialog. File magic bytes are verified locally on device.
Select a quality preset (Lossless, Visually Lossless, Balanced, Smallest) or adjust advanced encoding switches in the options panel.
Click CONVERT to execute local WebAssembly compilation. Save the finished .png directly to local storage, or stage it for chaining.
Prefer local shell scripting? Run this standard POSIX command on your machine to achieve equivalent transcoding without a web interface:
# Convert SKETCH to PNG locally
magick input.sketch output.pngWorking with files across multiple web pages? The official convrtr Chrome Extension adds native Side Panel docking, right-click context menu media extraction, and visible viewport capture. Powered by the same zero-upload client-side WebAssembly engine.
Detailed technical comparison between PNG and JPG (JPEG). Understand lossless vs lossy compression, alpha channel transparency, and file size optimization.
Compare WebP and PNG file sizes, transparency handling, browser support, and compression performance for web graphics and illustrations.
Compare Commodore 64 KoalaPainter (.koa) graphics with 32-bit RGBA PNG. Learn about VIC-II multi-color constraints, color clash, 16-color palettes, and lossless web images.
Drop it here. Sketch renders each page to previews/preview.png every time the document is saved, and this tool extracts that render at full resolution — enough to review, present, attach to tickets, or hand to developers.
The full page render at the resolution Sketch saved it, typically the complete artboard composition. Vector editability is not preserved — for that you need Sketch, Figma's importer, or Lunacy.
You will get a clear error instead of a corrupt image. Re-saving the document once in Sketch with previews enabled fixes it permanently.
No. Unzipping and extraction happen entirely inside your browser. Confidential screens never leave your device.
SKETCH Graphic Raster (SKETCH) and Portable Network Graphics (PNG) serve distinct roles across the digital workflow. Converting to PNG provides optimized compatibility, modern compression efficiency, or standardized playback across web browsers, operating systems, and media production environments.
The output format (PNG) is inherently lossless or supports lossless operation. Your original visual or audio fidelity is mathematically preserved without quantization artifacts.
Never. convrtr is architected with a strict zero-upload model. All processing, decoding, decompression, and encoding happen 100% locally on your machine using sandboxed WebAssembly and Web Workers. Your data never touches an external server, database, or analytics collector.
You can execute this conversion locally via command-line utilities such as ffmpeg, cwebp, or ImageMagick. For example: see the developer terminal recipe provided in the technical specifications dossier above. convrtr provides the identical local-first capability directly inside your browser without installing CLI packages.
Yes. You can drop multiple .sketch files into the instrument to process them concurrently in browser Web Workers, or click 'Open in Master Studio' to queue mixed formats, configure individual targets, and export as a single ZIP archive.
Convert web media, local files, and document assets directly in Chrome Side Panel using client-side WebAssembly, zero-server uploads, and the official convrtr browser extension.
A byte-level walkthrough of the MLW container format: the Root marker, the filename block, the AES-GCM payload, and the one part of the layout nobody has documented.
MLW uses a single fixed encryption key shared across every install of the app. What that means for whether unwrapping it counts as DRM circumvention — in plain English, not legal advice.