# Free Online FSR Video Upscaler Boost clip resolution with edge-adaptive FSR upscaling in your browser. HTML: https://grepcut.com/en/tools/video-upscaler ## Read This First: FSR Sharpens Edges, It Does Not Invent Detail Set your expectations before you start. FSR makes edges cleaner as it enlarges your clip, but on footage that is already soft, low-bitrate or out of focus the improvement is often marginal, because there is very little real edge information to reconstruct. FSR is a spatial upscaler, not AI. It cannot add detail that was never captured. Rebuilding texture that is not in your source needs an AI super-resolution model, which is a different kind of tool. Use this upscaler to enlarge cleanly and sharpen edges, not to recover lost detail. ## How to Upscale Video Online in Your Browser 1. **Upload your clip**: Drop an MP4, MOV, WebM or MKV file onto the upload area. 2. **Choose 2×, 3× or 4×**: Pick the upscale factor that fits your timeline, social export or HD layout. 3. **Export your MP4**: Download the upscaled MP4, or open it in GrepCut Studio for captions, cuts and finishing. Upscaling runs locally in your browser, so your video stays on your device. ## Use FSR Upscaling When Your Clip Is Too Small If your clip was recorded at 480p, 720p or in a small screen-capture window, it can look undersized inside an HD edit. Upscaling increases the pixel dimensions before you export, so your video fits a 1080p timeline, a YouTube upload or a social preset without manual stretching in another editor. GrepCut upscales with FSR (AMD FidelityFX Super Resolution). Instead of a plain smooth stretch, FSR reconstructs edges as it enlarges, so lines and contours stay crisper than they would with bicubic scaling. That makes it a practical choice for compressed phone footage, tutorial clips and reposts that were exported too small. ### Best for: - **Old phone footage**: Bring a 480p or 720p clip closer to an HD layout with cleaner edges before posting. - **Screen recordings**: Make a small capture window easier to place in a tutorial or presentation edit. - **Social reposts**: Resize vertical clips that came back from another app at a lower resolution. ## How FSR Upscaling Works, and What It Can and Cannot Fix FSR is a spatial upscaler: it works from the single frame in front of it, with no motion vectors, depth buffer or AI model. It runs in two GPU passes. First EASU (Edge-Adaptive Spatial Upsampling) resamples the frame in a direction-aware way, detecting how neighbouring gradients differ so edges are reconstructed instead of just blurred. Then RCAS (Robust Contrast-Adaptive Sharpening) adds a controlled sharpen that lifts detail without pushing halos or amplifying noise. Because FSR uses ordinary shaders and never looks at other frames, it treats every frame the same way and keeps your export consistent. It is not AI super-resolution though. If your source is badly blurred, heavily compressed or missing fine detail, FSR can fit a larger frame with sharper edges, but it cannot rebuild texture that was never captured. ### Under the hood: - **EASU**: Edge-adaptive resample that reconstructs edges as it enlarges, sharper than bilinear or bicubic. - **RCAS**: Contrast-adaptive sharpening pass, applied automatically, that adds bite to real edges while leaving flat areas alone. For very soft footage, try a short test export first. If the preview already looks too soft, a smaller factor often looks more natural than a hard 4× stretch. ## How FSR Compares to Plain Scaling | Method | How it scales | Typical result | | --- | --- | --- | | Nearest-neighbor | Duplicates the closest pixel. | Blocky, hard stair-stepped edges. | | Bilinear or bicubic | Averages the surrounding pixels. | Smoother, but edges look soft. | | FSR (EASU + RCAS) | Edge-adaptive resample plus contrast-aware sharpen. | Cleaner, crisper edges without an AI model. | FSR reconstructs edges rather than only smoothing them, but like every spatial method it works with the detail already in your clip. ## Which Upscale Factor Should You Choose? The right factor depends on how far your clip is from the size you need. Bigger factors create more pixels to reconstruct, so a soft source shows its limits sooner at 4× than at 2×. ### Pick your factor: - **2×**: A safe first test when your clip only needs a moderate size boost. - **3×**: Useful when a small clip needs to fill more of an HD canvas. - **4×**: Best for short clips where you need maximum dimensions and can wait a little longer. Start with 2× when you are unsure, then retry at a larger factor if your source has enough detail to hold up. ## The Preview Matches Your Export FSR upscales and sharpens automatically, so there is nothing to configure. Pick a factor, check the result and export. EASU handles the edge-adaptive enlargement and RCAS adds a fixed, tasteful sharpen on top. The before and after preview runs the same FSR pipeline as the export, so what you see is what lands in your MP4. Zoom the preview in to judge edge crispness before you commit to a full render. If the preview still looks soft after upscaling, that usually means the detail was not in the source to begin with, and a lower factor may look more natural. ## Keep Your Video Private While You Test Online video tools often ask you to upload the whole file before you can see a result. This upscaler runs in your browser instead, so your footage does not leave your device during processing. That is useful when your clip contains private screen content, unreleased social footage, client drafts or classroom recordings. You can test a factor, download the MP4 and continue editing without sending the original file to a server. Longer clips and 4× exports depend on your device speed. For quick checks, trim the clip first or test a short section before processing the full video. ## Video Upscaler at a Glance ### Advantages - Runs locally in your browser with no upload. - FSR reconstructs edges, so results look sharper than bicubic scaling. - EASU upscaling and RCAS sharpening are applied automatically, nothing to configure. - 2×, 3× and 4× presets keep the choice simple. - Free MP4 export with no watermark. ### Disadvantages - It is a spatial upscaler, not AI, so it cannot invent detail that was not captured. - Very blurry or heavily compressed sources can still look soft. - Long 4× exports can take longer on slower devices. - If your browser lacks WebGL2 it falls back to a plain bicubic scale. > FSR 1 doesn't look at previous frame data to enhance its upscaling but just stretches each isolated image, using techniques such as edge-detection to help determine how best to stretch the image. > > PCGamesN ## Video Upscaler FAQ ### Can you upscale video online without uploading it? Yes. Your video is processed locally in your browser, so the file stays on your device. ### Is FSR the same as AI upscaling? No. FSR is a spatial upscaler that runs on ordinary shaders and works from a single frame. It reconstructs edges with EASU and sharpens with RCAS, but it does not use a neural network, so it cannot invent detail the way AI super-resolution tries to. ### How is FSR different from bicubic upscaling? Bicubic averages nearby pixels, which enlarges the frame but leaves edges soft. FSR looks at how neighbouring gradients change and resamples along edges, so lines and contours stay crisper, then RCAS adds a controlled sharpen on top. ### Will FSR make your blurry video sharp? It can make edges look cleaner and add some bite, but the improvement is often marginal on soft footage, and it cannot restore missing detail from a blurry, low-bitrate or out-of-focus source. Recovering detail that is not there needs an AI upscaler. ### Which upscale factor should you use? Use 2× for a safe first pass, 3× when your clip needs a stronger size boost, and 4× for short low-resolution clips where you need the largest output. ### Can you upscale a 480p video for a 1080p edit? Yes. You can enlarge the clip before placing it in an HD timeline. FSR keeps edges cleaner than a plain stretch, though the result can still look softer than native 1080p footage because the original has fewer pixels. ### Do you need to adjust any settings? No. FSR upscales with EASU and sharpens with RCAS automatically, so you just pick a factor and export. The before and after preview uses the same pipeline as the export. ### What video formats can you import, and is there a watermark? You can import MP4, MOV, WebM and MKV files, and export your upscaled MP4 without a watermark. ## Sources & further reading - [AMD GPUOpen overview of FidelityFX Super Resolution 1 (EASU and RCAS)](https://gpuopen.com/fidelityfx-superresolution/) - [AMD GPUOpen FSR 1 spatial upscaling technique manual](https://gpuopen.com/manuals/fidelityfx_sdk/techniques/super-resolution-spatial/) - [FidelityFX Super Resolution 1.0 demystified (shader walkthrough)](https://jntesteves.github.io/shadesofnoice/graphics/shaders/upscaling/2021/09/11/amd-fsr-demystified.html) - [Tom's Hardware: testing FSR performance and image quality](https://www.tomshardware.com/news/amd-fidelityfx-super-resolution-fsr-performance-tested) - [guru3D forum thread: FSR 1 is great for what it is](https://forums.guru3d.com/threads/fsr-1-is-great-actually-for-what-it-is.453779/) - [Reddit thread on why scaled-up footage can look blurry](https://www.reddit.com/r/premiere/comments/1asd5id/scaling_up_video_to_a_higher_resolution_makes_it/) - [Wikipedia overview of image scaling methods](https://en.wikipedia.org/wiki/Image_scaling) ## Done Upscaling? Polish the Full Edit Open your upscaled MP4 in GrepCut Studio to cut the timeline, add captions, adjust the look and export the final video in your browser. ## Related Tools - [Resize Video](https://grepcut.com/en/tools/resize-video) - scale your clip by percentage. - [Change Video Speed](https://grepcut.com/en/tools/change-video-speed) - slow down or speed up your footage. - [Blur Video](https://grepcut.com/en/tools/blur-video) - soften backgrounds or hide sensitive areas.