# Before After Image Slider - Free Online Comparison Upload before and after images, drag an interactive preview slider, then export a frozen split PNG or side-by-side PNG. Interactive drag is preview-only. Browser-only - max 50.00 MB per file. ### Upload & export Before image Choose or drop before image PNG, JPG, WebP · Max 50.00 MB After image Choose or drop after image PNG, JPG, WebP · Max 50.00 MB Export style Live dragging is preview-only. Exports are static PNGs - either a slider frozen at 50% or both images side by side. Download PNG Clear ### Interactive preview Upload both images to drag the comparison slider ## What is a before after image slider? A before after image slider is a free online comparison tool that places two photographs - typically a “before” state and an “after” state - into one shared frame so viewers can drag a vertical handle and reveal the change. Instead of asking readers to open two tabs or scroll past a pair of loosely aligned thumbnails, the slider keeps both shots registered to the same composition. That registration is what makes renovations, retouching, design iterations, and product upgrades feel honest: the lighting, crop, and camera angle stay consistent while only the subject changes. Interactive comparison is ideal while you are editing or reviewing work on a laptop. Clients drag the handle, pause on problem areas, and immediately understand what improved. Blog readers and newsletter subscribers, however, often receive a static asset. Email clients, many CMS image blocks, and social feeds do not run custom slider JavaScript. That is why this before after image slider is honest about export: the drag experience is preview-only, and the download is either a frozen split PNG at your chosen divider position or a clean side-by-side PNG with both images labeled. ToolComb’s tool runs entirely in the browser. You upload the before image and the after image locally, drag the handle in the live preview, choose frozen or side-by-side export, and download a PNG with a clear _toolcomb filename suffix. There is no account wall, no watermark stamped across the comparison, and no remote queue that holds your photos while shared hardware finishes a job. Teams use this flow for portfolio case studies, real-estate staging, dental and dermatology education (with appropriate consent), SaaS UI redesigns, photo-retouch portfolios, and landscaping proposals. When you need a fully interactive embed on a site you control, keep a JavaScript widget in the mix - but for everyday sharing in Slack, Notion, decks, and print PDFs, a frozen or side-by-side PNG from a private browser tool is faster and safer than uploading confidential work to a third-party mockup site. Because both images are cover-fitted onto one canvas, slight resolution mismatches still produce a usable reveal. For the fairest comparison, shoot or export both frames with matching aspect ratio and similar focal length. The tool will still help when dimensions differ, but pre-matching framing removes surprise crops at the edges of the slider window. Writers and marketers searching for a before after image slider online often need the asset the same afternoon. Waiting on a designer to build an interactive embed is overkill when the deliverable is a slide or a PDF. A frozen divider PNG communicates the story in contexts where JavaScript never runs, while the live drag handle still helps you choose which percentage of the frame tells the truth. That dual workflow - interactive preview, static export - is the practical compromise this page is built around. If you publish comparisons regularly, treat export style as a brand decision. Some editorial teams always ship side-by-side so print and web stay identical; others prefer frozen sliders for social crops where a single tall image performs better. Document the choice once, then reuse the same before after comparison settings so every launch looks intentional rather than improvised. ## How to create a before and after image comparison online Six short steps take you from two separate files to a downloadable comparison PNG. Keep the live preview open while you drag so the frozen export captures the story you intend. 1. **Open the before after image slider** Load this page in a modern browser. Both images stay in your tab - decoding, the interactive comparison preview, and PNG export never upload your files to a server. 2. **Upload the before image** Drag a PNG, JPG, or WebP into the Before dropzone, or click to browse. Prefer matching aspect ratios with the after shot so the slider reveals a fair comparison instead of stretched crops. 3. **Upload the after image** Add the second file the same way. The tool cover-fits both images into a shared canvas so the divider lines up across the same framing when dimensions differ slightly. 4. **Drag the interactive slider** Move the vertical handle left and right to reveal before versus after. The live drag is preview-only: a static PNG cannot keep a movable handle, so export uses a frozen split or a side-by-side layout instead. 5. **Choose export style** Pick frozen slider PNG to bake the current divider position into one image, or side-by-side PNG to place before and after next to each other with a thin gutter for decks and docs. 6. **Download the PNG** Click Download PNG. The filename keeps your before-image base name plus a comparison tag and _toolcomb so batches stay easy to find in Downloads. ## Before and after: presenting a room renovation ### Before A homeowner emails a contractor two phone photos - empty room and finished staging - as separate attachments. The client opens them out of order, zooms unevenly, and cannot tell whether the paint colour or the furniture drove the change. The conversation stalls on “which file is which?” instead of approving the next room. ### After The same pair is loaded into the before after image slider, aligned with cover fit, and exported as a frozen split at roughly forty percent with clear Before and After labels. In a follow-up deck, a side-by-side PNG sits under a short caption. Stakeholders grasp the transformation in seconds without installing software or dragging a live widget. Reuse the same export style across a project gallery so every renovation comparison looks like one visual system. Swap only the photo pair between rooms or phases. ## Practical uses for a before after image slider ### 1. Real-estate staging and listing updates Agents show vacant versus staged rooms without forcing buyers to swipe between album slides. A frozen or side-by-side PNG embeds cleanly in listing PDFs and email blasts. ### 2. Photo retouch and colour-grade portfolios Retouchers prove skin, sky, and exposure work honestly when both frames share framing. Clients drag the preview during review, then receive a static PNG for final approval threads. ### 3. SaaS UI redesign changelogs Product marketers compare old dashboard chrome with the new layout. Matching aspect ratios keep buttons aligned so readers notice the redesign, not a crop mismatch. ### 4. Landscaping and exterior makeovers Garden and facade projects benefit from seasonal or construction comparisons. Side-by-side exports work well on printed proposals where interactive embeds are impossible. ### 5. Dental, dermatology, and wellness education Clinics sometimes illustrate typical outcomes with consented imagery. Local browser processing keeps patient photos off third-party upload sites while you prepare teaching materials - always follow professional advertising rules. ### 6. Cleaning and restoration services Carpet, graffiti, and water-damage teams document results for insurance and marketing. A labeled frozen slider PNG survives PDF attach without broken JavaScript. ### 7. Fitness and personal progress journals Individuals compare form or physique photos privately on their own device. Because nothing uploads, sensitive progress shots never leave the laptop until they choose to share the export. ### 8. Architecture and interior design reviews Studios contrast concept renders with site photos or successive design options. Consistent framing turns subjective taste debates into clearer visual evidence. ### 9. E-commerce product photography improvements Merchants show upgraded lighting or packshot style versus older catalogue images. Side-by-side PNGs drop into Notion briefs for photographers without interactive widgets. ### 10. Agency client before-and-after case studies Agencies publish transformation stories on proposal sites. Preview interactively in the meeting, then export a static asset that CMS editors can place without custom code. ## Before after comparison options compared Several paths can produce a before-and-after story. They differ in interactivity, privacy, and how easily the result embeds in everyday tools. | Option | Interactivity | Where files go | Best for | | --- | --- | --- | --- | | ToolComb before after image slider | Live preview; static PNG export | Stay in your browser | Private comparisons, decks, email | | JavaScript embed widgets | Fully interactive on your site | Depends on host | Marketing pages you control | | GIF or short video wipe | Auto-playing motion | Local or upload editors | Social feeds that favour motion | | Two separate images in a CMS | None | Your CMS storage | Simple articles with captions | | Desktop design apps | Mock interactive or static | Local disk | Brand kits and multi-page reports | Choose this browser tool when you need a private, fast comparison and a PNG that works everywhere. Keep a site embed when your landing page must stay interactive, and reach for design software when typography systems and multi-artboard layouts matter more than speed. ## Limits and tips - Interactive dragging is preview-only; exported PNGs cannot include a movable handle. - Cover-fit may crop edges when before and after aspect ratios differ - pre-match framing when possible. - Very large dual uploads can strain memory; scale huge camera files before comparing. - Animated GIF sources typically collapse to a single frame each. - Colour management depends on the browser canvas; proof critical brand colours on the target surface. - Labels are baked into the export so still images stay readable without the live UI. - One comparison pair per download; batch folders require repeating the export or scripting elsewhere. - Always obtain consent and follow advertising rules for medical, beauty, and testimonial imagery. ## Privacy while comparing before and after images Decoding, cover-fitting, slider preview, and PNG encoding use browser canvas APIs on your device. The photos you select are not posted to ToolComb for comparison or export. That matters for unreleased product UIs, patient education drafts, home interiors, and confidential renovation bids. Closing the tab clears in-memory image data; downloaded PNGs remain in your Downloads folder until you delete them. Local processing is not a substitute for consent or redaction. Blur faces, addresses, or account numbers before you publish a comparison externally, and avoid leaving finished exports on shared machines. When collaborators only need the story and not the raw captures, share the frozen or side-by-side PNG instead of both originals. Fewer source files in shared drives means less accidental redistribution of full-resolution before shots that you never meant to publish alone. ## Frequently Asked Questions ### What is a before after image slider? A before after image slider is a comparison view that stacks two photos in the same frame and lets you drag a divider to reveal one side versus the other. Marketers, renovators, retouchers, and product teams use it to show change over time without forcing viewers to flip between two separate files. ### Can I export an interactive slider? No. Interactive dragging only works in the live preview on this page. A downloaded PNG is a still image. Export either freezes the divider at your current position or places the two images side by side so the comparison survives email, Slack, and CMS embeds. ### Does this tool upload my photos? No. Loading, cover-fitting, slider rendering, and PNG encoding run in your browser. Watch the Network panel while you drag and download - your before and after bytes are not posted to a conversion API. ### What image formats work best? PNG, JPG/JPEG, and WebP are the most reliable. Matching resolution and aspect ratio produces the cleanest reveal. Extremely different sizes are scaled to a shared canvas with cover cropping so both fill the frame. ### When should I use side-by-side instead of frozen? Use side-by-side for print layouts, pitch decks, and articles where readers cannot drag. Use frozen slider when you want the classic reveal look with a vertical divider and want to highlight a specific region at a chosen percentage. ### Is there a file size limit? Each upload is capped at about 50 MB. Very large pixel dimensions can stress tab memory because both images are decoded and drawn together. Scale huge camera RAW exports down first if the tab feels sluggish. ### Will labels say Before and After on the export? Yes. Frozen and side-by-side exports include small Before and After labels so the still PNG remains readable without the interactive handle. ### Can I use this for medical or beauty results? You can create a visual comparison locally, but you remain responsible for consent, disclosure rules, and any industry advertising standards. Local processing does not equal legal clearance to publish. ### How is this different from GIF or video comparisons? Animated formats can loop a wipe, but they are heavier and harder to embed in some docs. A static frozen or side-by-side PNG is universal, sharp for UI and product shots, and easy to compress further if needed. ### Why do my images look cropped? Both images are cover-fitted to the same canvas so the slider divides one shared rectangle. If aspect ratios differ, edges may crop. Pre-crop both shots to the same framing for a pixel-perfect reveal. ## Related image tools - [Screenshot beautifier](https://www.toolcomb.com/screenshot-beautifier) - Frame UI captures with padding, shadow, and optional window chrome. - [Crop image](https://www.toolcomb.com/crop-image) - Match before and after framing before you build the slider. - [Resize image](https://www.toolcomb.com/resize-image) - Scale large camera files down for smoother dual-image previews. - [Image background remover](https://www.toolcomb.com/image-background-remover) - Knock out simple solid backgrounds before compositing comparisons. - [Social post mockup](https://www.toolcomb.com/social-post-mockup) - Place a finished comparison inside a Tweet/X or LinkedIn frame. - [Image compressor](https://www.toolcomb.com/online-image-compressor) - Shrink finished comparison PNGs for faster page loads. ## Related Tools Discover more free tools that might help with your next task. [Geo Tag Image GPS camera with location stamp, EXIF geotag, and NoteCam-style notes Use Tool](https://www.toolcomb.com/geo-tag-image) [Resize Image Resize by pixels or percent with optional aspect lock Use Tool](https://www.toolcomb.com/resize-image) [Crop Image Crop by coordinates or aspect presets Use Tool](https://www.toolcomb.com/crop-image) [Circle Crop Cut a round profile picture with transparent PNG Use Tool](https://www.toolcomb.com/circle-crop) [Rotate & Flip Image Rotate 90° steps or mirror images horizontally/vertically Use Tool](https://www.toolcomb.com/rotate-flip-image) [Watermark Image Stamp text or a logo with opacity and position control Use Tool](https://www.toolcomb.com/watermark-image) ### Related guides Read the how-to, then come back to this tool when you are ready to run it locally. - [Before/After Image Sliders for Portfolios and Renovations Align two photos, build a drag comparison slider in the browser, and embed results in portfolios - with honest limits on handheld shots.](https://www.toolcomb.com/blog/before-after-image-sliders-for-portfolios) - [Best Free Screenshot and Mockup Tools (No Upload) When to beautify a capture vs drop it in a device frame vs build an OG card - and how ToolComb's Image Editors hub groups mockup tools separately from format converters.](https://www.toolcomb.com/blog/best-free-screenshot-and-mockup-tools) [View All Tools](https://www.toolcomb.com/tools)