How do I compare two video files online?

Upload your two video files to DiffALL — it automatically calculates SSIM and PSNR frame by frame, shows a synchronized heatmap overlay highlighting every changed pixel, and identifies the exact second each difference appears. No install required, free to use.

How do I compare two images online and see the differences?

Drop two images into DiffALL. It produces a pixel-level difference heatmap alongside the original images, calculates a structural similarity (SSIM) score, and offers a flexible mode that handles rotation and lighting differences before comparing.

Can I compare SRT or VTT subtitle files online?

Yes. DiffALL supports SRT and VTT subtitle files. It calculates Word Error Rate (WER), shows a line-by-line diff with insertions and deletions highlighted, and measures timing drift — the millisecond offset between corresponding subtitle entries.

How do I compare two audio files and find differences?

Upload any two audio files (MP3, WAV, FLAC, AAC, OGG, M4A, OPUS) to DiffALL. It compares them using MFCC spectral similarity, spectral centroid, and RMS energy, and displays a spectrogram difference overlay so you can see exactly where the audio diverges.

How do I diff two JSON files and see what changed?

DiffALL recursively flattens both JSON files into dotted key-value paths and shows a structural diff — which keys were added, removed, or changed — with inline character-level highlighting. It also handles plain text, CSV, XML, YAML, and Markdown.

How do I find visual bugs between two files?

Upload the expected and actual files to DiffALL. It highlights every visual bug with a heatmap overlay, draws bounding boxes around each changed region, and pinpoints the exact frame or area where the bug appears — so you spend zero time hunting manually.

How do I detect visual differences between two images?

DiffALL compares two images pixel by pixel and generates a colour-coded heatmap that highlights every region that differs. It also calculates an SSIM similarity score and supports a flexible mode for images that were taken from different angles or under different lighting.

How do I detect visual differences between two videos?

Upload both videos to DiffALL. It analyses every frame, overlays a heatmap on the live player to show exactly what changed and when, plots a per-second similarity graph, and flags the worst moments with timestamps — all without manual scrubbing.

DiffALL — Compare Video & Audio Files Online | Media QA & Visual Regression Tool

Spot Every Difference.
Even in Video & Audio.

The only online diff tool built for media. Upload expected and actual — get a heatmap, the exact timestamp of every difference, and a similarity score in seconds. Images, subtitles, text & JSON included.

MP4 · AVI · MOV · MKV MP3 · WAV · FLAC · AAC JPG · PNG · WEBP · GIF SRT · VTT TXT · JSON · CSV · XML

Expected

Drop file here or click to browse

Image · Video · Audio · Subtitle (SRT/VTT) · Text / JSON

Actual

Drop file here or click to browse

Image · Video · Audio · Subtitle (SRT/VTT) · Text / JSON

No files handy?

This comparison will use 1 credit

API Keys

Use the comparison API from scripts and CI. Each call costs one credit.

Built for Testers Who Need Answers, Not Just Two Videos

A side-by-side player is a viewer. DiffALL is a detector. Designed from the ground up for QA engineers, video encoding teams, and visual-regression automation.

Pinpoint the Failure

Phosphorescent markers around every changed region
Per-second similarity graph reveals transient drops
Worst-moment timestamp — jump straight to the bug
Frame-level heatmap overlaid on the live player

Quantify the Regression

SSIM & PSNR — proven perceptual quality metrics
Frame-by-frame numbers, not just a single score
Catches subtle drift a human eye would miss
Numbers your QA report can defend

Made for Workflows

Full JSON export of every comparison
Recent-comparisons history saved per session
Fast enough for live manual QA review
Cheap enough for nightly visual-regression rounds

Drop two videos in. Get a structured report in seconds. That's a QA tool.

How It Works

Three steps. Zero configuration.

Upload Two Files

Drop any two files of the same type — video, image, audio, subtitle, or text.

Auto-Detected & Analyzed

DiffALL picks the right engine — SSIM & VMAF for video, MFCC for audio, pixel diff for images.

Read the Report

Similarity scores, charts, frame comparisons, and a full JSON export — ready in seconds.

Deep Analysis for Every Format

Video

Auto-located bounding boxes around each change
Frame-by-frame heatmap overlay
Pinpoints the exact second each bug appears
Synchronized 3-panel live player
SSIM · PSNR similarity scores

Image

Pixel-level diff overlay
Structural similarity score
Flexible mode for real photos
Difference heatmap

Audio

MFCC spectral similarity
Waveform comparison
Per-second divergence
Spectrogram diff

Subtitles

Word Error Rate (WER)
Timing drift analysis
Line-by-line diff
SRT · VTT supported

Text & JSON

Semantic similarity score
Inline change highlighting
JSON structure diff
TXT · JSON · CSV · XML

Simple, Transparent Pricing

Start free, go Pro for serious media QA, or go unlimited for API-heavy teams.

Free

50 comparisons per day
Video up to 30s · audio up to 1 min
All file types & formats
All analysis metrics

Best Value

Pro

$9 / month

Unlimited web comparisons
Video up to 1 min · audio up to 3 min · 150 MB files
500 API comparisons / month for CI
Priority support · JSON export

Unlimited

Enterprise

Custom tailored to your volume

Unlimited comparisons
Full API access & higher rate limits
Priority processing & support
Volume pricing & invoicing

Spot Every Difference.Even in Video & Audio.