Merge Images Vertically Tool: Stack Images, Long Scrolling Screenshots & Webtoons
Stacking multiple images top-to-bottom into a continuous vertical canvas is indispensable for documenting multi-screen mobile chat conversations, compiling receipt logs, creating episodic webtoons and comic strips, and presenting multi-slide marketing infographics. Manually opening separate files, extending canvas heights, and stitching seams in complex graphic suites wastes valuable time.
Our browser-native vertical image merger automatically stacks any number of photos into a seamless vertical scroll with width normalization. With full control over vertical dividers, background margins, and border padding, you can assemble professional multi-image vertical banners in seconds—completely client-side with zero cloud uploads.
Automated Width Normalization & Proportional Scaling
Similar to horizontal merging, combining images vertically introduces width discrepancies. If Image 1 is 1080px wide (e.g. an iPhone screenshot) and Image 2 is 720px wide, simply stacking them creates an awkward, stepped layout.
Our engine provides automated width normalization: all incoming graphics scale proportionally to match a uniform target width, ensuring consistent left and right margins throughout the entire vertical scroll. Aspect ratios remain perfectly locked, preventing distortion or squishing.
Applications: Chat Logs, Digital Receipts, Infographics & Webtoons
Vertical stacking solves numerous common documentation challenges. Legal professionals and customer support teams frequently stack sequential smartphone screenshots to compile uninterrupted, readable records of SMS or WhatsApp message threads.
Similarly, accountants and small business owners merge multiple expense receipts into a single file for audits. Digital artists and comic illustrators assemble continuous vertical scrolling webtoons optimized for smartphone reading apps.
Production Pipeline: Harmonization, Compression & PDF Archival
Before stacking, crop away redundant system status bars or battery indicators using Crop Image to keep the conversation stream clean. If certain frames are underexposed, balance their lighting using Adjust Brightness and Adjust Contrast.
Once your vertical stack is assembled, download it as a high-resolution PNG or WebP, or route the composite directly into our Convert Images to PDF tool to generate an archival PDF document ready for email or legal submission.
⚡How to Merge Images Vertically in 3 Easy Steps
1. Select Your Images
Drag and drop your screenshots, receipts, or panels into the vertical merger workspace.
2. Adjust Spacing & Width
Set vertical gutter spacing, background color, and choose automated width normalization.
3. Download Vertical Stack
Preview the continuous scrolling composite and click Download to save your image.
💡Pro Tips for Vertical Image Stacking
- •Crop off phone status bars and navigation docks prior to merging to create seamless conversation flows.
- •Choose "Scale to Match" mode so all screenshots share identical widths and uniform side margins.
- •Use a subtle 2px to 4px colored divider line between receipts to clearly demarcate separate transactions.
- •Pass long vertical composites through Convert PNG to WebP to keep file sizes lightweight for mobile messaging.
🛡️Dynamic Canvas Height Allocation & Memory Buffering
Our vertical merger computes cumulative Y-axis offsets: Y_(i+1) = Y_i + ScaledHeight_i + Gutter. The total canvas height is dynamically allocated as TotalHeight = sum(ScaledHeights) + (N - 1) * Gutter + 2 * Padding. Images are drawn sequentially with sub-pixel alignment. All image rasterization and compositing occur strictly within your browser's local sandboxed memory. Your private chat logs, financial receipts, and proprietary sketches are never uploaded to remote cloud servers.
Stack: WebAssembly • Multi-threaded Web Workers • HTML5 Canvas API
Privacy: Zero remote tracking, zero cloud buffer, zero cookie telemetry.
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