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UtraDiff is a free online diff tool for comparing any two files side-by-side. Upload code, JSON, CSV, YAML, XML, images, PDFs, Word documents, or any of 100+ supported formats. See differences instantly with syntax highlighting, structural comparison, and visual diff — all processed in your browser with no signup required.
Why UtraDiff?
Cross-format comparison
Compare JSON vs YAML, TOML vs INI, and more. The only online diff tool with semantic tree comparison across 14 structured formats — matching keys and rows, not just lines of text.
Privacy-first
Your files never leave your browser. All text, code, and image diffs are processed locally — no uploads, no server storage, no tracking, no signup required. GDPR friendly by design.
100+ formats
Code, data, images, PDFs, Word, Excel — one tool handles them all. Side-by-side code diff with syntax highlighting, structural diff for data formats, and pixel-level visual comparison for images and documents.
Free forever
No ads, no accounts, no paywalls. Unlimited file comparisons with full features for everyone — unlike diff tools that charge $15–40/month for basic functionality.
Supported formats
Code & Text
Line-by-line text diff with syntax highlighting. Compare source code, config files, scripts, and plain text in 80+ languages.
ABAP
ABAP — SAP's proprietary programming language for business applications. Used in enterprise resource planning and financial systems.
Apex
Apex — Salesforce's strongly-typed programming language for building business logic on the Force.com platform.
ATS
ATS — A statically-typed functional language with dependent types and linear types for systems programming with formal verification.
Azure CLI
Azure CLI — Azure CLI command scripts for managing Microsoft Azure cloud resources and services.
Batch
Batch — Windows batch scripts for task automation and system administration. Executed by the Windows command interpreter.
Bicep
Bicep — A domain-specific language for deploying Azure resources declaratively. Simpler alternative to ARM templates.
C
C — A low-level systems programming language. The foundation for operating systems, embedded systems, and performance-critical code.
C#
C# — A modern, object-oriented language by Microsoft. Used for .NET applications, Unity game development, and enterprise software.
C++
C++ — An extension of C with object-oriented features. Used in game engines, high-performance computing, and system software.
CameLIGO
CameLIGO — An OCaml-inspired smart contract language for the Tezos blockchain. Part of the LIGO language family.
Clojure
Clojure — A modern Lisp dialect on the JVM emphasizing immutability and concurrency. ClojureScript compiles to JavaScript.
CoffeeScript
CoffeeScript — A language that compiles to JavaScript with a cleaner syntax inspired by Ruby and Python.
CSP
CSP — Content Security Policy definitions for controlling which resources a web page can load. Used in HTTP security headers.
CSS
CSS — Cascading Style Sheets for styling web pages. Controls layout, colors, fonts, and responsive design.
Cypher
Cypher — Neo4j's declarative graph query language for pattern matching and traversing nodes and relationships.
Dart
Dart — A client-optimized language by Google. The primary language for Flutter cross-platform app development.
DAX
DAX — Data Analysis Expressions for Microsoft Power BI, Analysis Services, and Power Pivot formula calculations.
Diff/Patch
Diff/Patch — Unified diff format showing changes between two files. Used by version control systems and code review tools.
Dockerfile
Dockerfile — Instructions for building Docker container images. Defines the base image, dependencies, and runtime configuration.
ECL
ECL — Enterprise Control Language for the HPCC Systems big data platform. Declarative language for data-intensive computing.
Elixir
Elixir — A functional language on the Erlang VM designed for scalable, fault-tolerant applications. Known for the Phoenix web framework.
F#
F# — A functional-first .NET language with strong type inference. Used for data science, web development, and financial modeling.
Flow9
Flow9 — A functional programming language with automatic UI generation and cross-platform compilation capabilities.
FreeMarker
FreeMarker — A Java template engine for generating HTML, email, configuration files, and source code from templates.
Go programming language diff
Go — A statically-typed language by Google designed for simplicity, concurrency, and fast compilation. Popular for cloud infrastructure and CLI tools.
GraphQL
GraphQL — A query language for APIs with a type system. Compare schema definitions, queries, and mutations.
Handlebars
Handlebars — A logic-less templating language extending Mustache. Commonly used in Ember.js and email template systems.
HCL/Terraform
HCL/Terraform — HashiCorp Configuration Language for defining infrastructure as code. Used by Terraform, Packer, and Vault.
Java
Java — A strongly-typed, object-oriented language widely used in enterprise applications, Android development, and backend services.
JavaScript
JavaScript — The most widely used programming language for web development, running in browsers and on servers via Node.js.
Julia
Julia — A high-performance language for scientific computing, data science, and numerical analysis. Combines speed with ease of use.
Kotlin
Kotlin — A modern, concise language for JVM and Android development. Fully interoperable with Java.
LESS
LESS — A CSS preprocessor with variables, mixins, and functions. Similar to SCSS with a slightly different syntax.
Lexon
Lexon — A language for writing legal contracts as code. Designed to be readable by both lawyers and machines.
Liquid
Liquid — Shopify's template language for building dynamic storefronts. Also used by Jekyll and other static site generators.
Lua
Lua — A lightweight, embeddable scripting language. Popular in game development, Neovim plugins, and embedded systems.
Makefile
Makefile — Build automation scripts using GNU Make. Defines targets, dependencies, and shell commands for compiling projects.
Markdown
Markdown — A lightweight markup language for formatting plain text. Used in README files, documentation, and content management.
MDX
MDX — Markdown with embedded JSX components. Used in documentation sites, blogs, and content-driven React applications.
MIPS
MIPS — MIPS assembly language for the MIPS instruction set architecture. Widely used in computer architecture education.
Modula-3
Modula-3 — A systems programming language descended from Modula-2. Influenced Java and C# with its module and type system.
MySQL
MySQL — MySQL-specific SQL dialect with extensions for stored procedures, triggers, and MySQL-specific functions.
Objective-C
Objective-C — Apple's legacy language for macOS and iOS development. Adds Smalltalk-style messaging to C. Predecessor to Swift.
Pascal
Pascal — A structured programming language by Niklaus Wirth. Still used via Delphi and Free Pascal for desktop applications.
PascaLIGO
PascaLIGO — A Pascal-inspired smart contract language for the Tezos blockchain. Part of the LIGO language family.
Perl
Perl — A flexible text-processing language used for system administration, web development, and bioinformatics.
PHP
PHP — A server-side scripting language powering a large portion of the web, including WordPress and Laravel applications.
PLA
PLA — Programmable Logic Array format for describing digital logic circuits as sum-of-products expressions.
Plain Text
Plain Text — Unformatted text files and log files. The universal fallback format for any text-based content.
PostgreSQL
PostgreSQL — PostgreSQL-specific SQL dialect with extensions for PL/pgSQL, CTEs, and PostgreSQL-specific functions.
Power Query
Power Query — Microsoft's M language for data transformation in Power BI, Excel, and Azure Data Factory.
PowerShell
PowerShell — Microsoft's cross-platform task automation framework. Combines a command-line shell with a scripting language.
Protocol Buffers
Protocol Buffers — Google's language-neutral data serialization format. Used with gRPC for defining service APIs and message schemas.
Pug
Pug — A high-performance template engine with indentation-based syntax. Formerly known as Jade. Compiles to HTML.
Python
Python — A versatile, readable programming language used for web development, data science, automation, and AI/ML.
Q#
Q# — Microsoft's domain-specific language for quantum computing algorithms and quantum circuit simulation.
R
R — A language for statistical computing and data visualization. Widely used in academia and data science.
Razor
Razor — ASP.NET's template syntax mixing C# with HTML. Used in Razor Pages and Blazor component development.
Redis
Redis — Redis command scripts for interacting with the Redis in-memory data store. Used for caching and message brokering.
Redshift
Redshift — Amazon Redshift SQL dialect with extensions for columnar storage, distribution keys, and Redshift-specific functions.
reStructuredText
reStructuredText — A markup language used by Python's Sphinx documentation generator. Standard for Python project documentation.
Ruby
Ruby — A dynamic, expressive language designed for developer happiness. Known for the Ruby on Rails web framework.
Rust
Rust — A systems programming language focused on safety and performance. Guarantees memory safety without a garbage collector.
Scala
Scala — A language combining object-oriented and functional programming on the JVM. Used for big data processing with Apache Spark.
Scheme
Scheme — A minimalist Lisp dialect emphasizing functional programming. Widely used in computer science education and research.
SCSS
SCSS — A CSS preprocessor adding variables, nesting, mixins, and functions. Compiles to standard CSS.
Shell
Shell — Unix shell scripts for task automation, system administration, and CI/CD pipelines.
Small Basic
Small Basic — Microsoft's simplified BASIC dialect designed for beginners learning to program. Features a minimal API.
Solidity
Solidity — The primary language for Ethereum smart contracts. Statically-typed with a JavaScript-like syntax for blockchain development.
Sophia
Sophia — A functional smart contract language for the Aeternity blockchain. ML-inspired with built-in state management.
SPARQL
SPARQL — A query language for RDF graph databases and the Semantic Web. Standard for querying linked data and knowledge graphs.
SQL
SQL — Structured Query Language for database operations. Compare schema migrations, stored procedures, and query files.
Structured Text
Structured Text — An IEC 61131-3 programming language for industrial automation and PLC programming. Pascal-like syntax.
Swift
Swift — Apple's modern programming language for iOS, macOS, watchOS, and tvOS development. Safe, fast, and expressive.
SystemVerilog
SystemVerilog — A hardware description and verification language for designing and testing integrated circuits and FPGAs.
Tcl
Tcl — Tool Command Language — a dynamic scripting language used for rapid prototyping, testing, and GUI development with Tk.
Twig
Twig — A flexible PHP template engine used by the Symfony framework. Features sandboxing and template inheritance.
TypeScript
TypeScript — A typed superset of JavaScript that compiles to plain JS. Adds static types, interfaces, and modern language features.
TypeSpec
TypeSpec — Microsoft's language for defining API contracts. Generates OpenAPI specs, client libraries, and server stubs.
Visual Basic
Visual Basic — Microsoft's event-driven programming language. Used in legacy enterprise applications and Office VBA macros.
WGSL
WGSL — WebGPU Shading Language for writing GPU compute and rendering shaders in web applications.
Data & Config
Semantic structural diff for data formats. Compare JSON vs YAML, CSV row-matching, XML tree diff, and cross-format comparison.
CSV
CSV — Comma-separated values for tabular data. The universal format for spreadsheet data exchange and database exports.
Environment
Environment — Environment variable files with key=value pairs. Used to configure application secrets and settings per environment.
HTML
HTML — HyperText Markup Language — the standard markup for web pages. Supports both text diff and structural DOM tree diff.
INI
INI — A simple configuration format with sections and key-value pairs. Common in Windows applications and PHP configuration.
JSON
JSON — JavaScript Object Notation — the most common data interchange format. Used for APIs, configuration, and data storage.
JSON5
JSON5 — An extension of JSON that allows comments, trailing commas, and unquoted keys. More human-friendly for configuration files.
JSONL
JSONL — Newline-delimited JSON — one JSON object per line. Used for log streams, data pipelines, and bulk data processing.
Properties
Properties — Java properties files with key=value pairs. Used for application configuration and internationalization in JVM projects.
TOML
TOML — Tom's Obvious Minimal Language — a configuration file format designed to be easy to read. Used by Cargo (Rust) and pyproject.toml.
TSV
TSV — Tab-separated values — similar to CSV but uses tabs as delimiters. Common in bioinformatics and data analysis.
XML
XML — Extensible Markup Language for structured data. Used in configuration files, web services (SOAP), and document formats.
YAML
YAML — A human-readable data serialization format. Popular for configuration files (Docker Compose, Kubernetes, CI/CD).
Images & Documents
Pixel-level visual diff for images, PDFs, spreadsheets, and Office documents. Side-by-side, overlay, and heatmap modes.
Excel
Excel — Microsoft Excel spreadsheets. Compare cell values, formulas, and structure across sheets.
GIF
GIF — Graphics Interchange Format supporting animation and transparency. Compared as a static image (first frame).
JPEG
JPEG — The most common lossy image format. Used for photographs and web images where file size matters.
ODS
ODS — OpenDocument Spreadsheet — the open standard equivalent of Excel. Same cell-level comparison capabilities.
PDF
PDF — Portable Document Format for documents, reports, and forms. Compare page-by-page with text extraction and visual overlay.
PNG
PNG — Portable Network Graphics — lossless image format with transparency. Ideal for screenshots, UI assets, and diagrams.
PowerPoint
PowerPoint — Microsoft PowerPoint presentations. Slide content extracted and compared as text.
SVG
SVG — Scalable Vector Graphics — XML-based vector images. Supports all three diff modes: text (source), structural (DOM tree), and visual (rendered pixels).
WebP
WebP — A modern image format by Google offering both lossy and lossless compression with smaller file sizes than JPEG/PNG.
Word
Word — Microsoft Word documents. Text extracted and compared with formatting indicators.