SemVer Calculator — Free Online Semantic Version Checker & Comparator
Free online SemVer calculator. Compare semantic versions, validate semver strings, and calculate next patch, minor, and major versions instantly.
To compare semantic versions, enter two version numbers in Version A and Version B; the tool shows which is newer and the next patch, minor and major versions of A.
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SemVer Calculator — Free Online Semantic Version Checker & Comparator. Free online SemVer calculator. Compare semantic versions, validate semver strings, and calculate next patch, minor, and major versions instantly.
Use our free SemVer calculator to compare two semantic versioning strings and instantly determine which is newer.
Whether you are managing npm packages, Cargo crates, Composer dependencies, or any package ecosystem that follows semver, this tool handles major, minor, patch, and pre-release comparisons precisely.
Enter any two version strings — like 1.2.3, 2.0.0-beta.1, or 1.4.0-rc.2 — and get an instant comparison result with a clear visual indicator.
Our semantic version checker follows the official SemVer 2.0.0 specification so your dependency decisions are always correct. Related: Crontab Generator, Chmod Calculator.
Beyond comparison, our semver checker also parses any version string into its major, minor, and patch components, giving you a clear breakdown at a glance.
It also calculates the next patch, minor, and major releases from your current version — perfect for release planning and changelog automation.
Whether you need a semver validator to catch malformed version strings, or want to quickly compare versions across your microservices or monorepo, this browser-based tool keeps your data private with zero server uploads.
Try our UUID Generator and Hash Generator for other developer workflow tools.
Frequently asked questions
How do I compare two semver versions?
Type one version in Version A and another in Version B, for example 1.2.3 and 1.3.0. The comparison symbol between them and the sentence below tell you whether A is newer than, older than or equal to B.
How do I calculate the next version number?
Enter your current version in Version A. Next Versions lists the next patch, minor and major release, for example 1.2.4, 1.3.0 and 2.0.0 for 1.2.3. For a pre-release the release it leads to comes first, so the next patch of 1.0.0-beta is 1.0.0 and the next minor of 1.2.0-rc.1 is 1.2.0. Each value has a copy button.
What version formats are accepted?
Versions follow the SemVer 2.0.0 grammar: three numeric parts, MAJOR.MINOR.PATCH, optionally followed by a hyphen and a pre-release tag and by a plus sign and build metadata, such as 2.0.0-beta.1+build.5. Numbers with leading zeros, such as 01.2.3 or 1.0.0-beta.01, and empty identifiers are rejected. A leading v, as in v1.2.3, is ignored.
How are pre-release versions compared?
A pre-release is older than the same version without one, so 1.0.0-rc.1 comes before 1.0.0. Pre-release tags are compared part by part: numeric parts as numbers, so beta.2 comes before beta.10, other parts alphabetically, numbers before words, and a shorter tag before a longer one with the same start. Build metadata is ignored.
What do major, minor and patch mean in semantic versioning?
Under SemVer you increase MAJOR for incompatible API changes, MINOR for new backwards-compatible features and PATCH for backwards-compatible bug fixes. The Parsed section breaks Version A into these three numbers.
How to use this online tool
SemVer Calculator — Free Online Semantic Version Checker & Comparator is designed for fast browser workflows when you need to format, validate, convert, decode, encode, generate, or inspect data without opening a heavy desktop app. Start with the input field or visible options, review the result, then copy or download the output for the next step.
Private processing in your browser
SemVer Calculator — Free Online Semantic Version Checker & Comparator keeps the normal processing step local in your browser. That is useful for code snippets, tokens, documents, configuration values, text samples, and other material that should not be sent to a remote service unless you explicitly choose to share it.
When this tool is useful
Use SemVer Calculator — Free Online Semantic Version Checker & Comparator for repeatable developer tasks, technical documentation, QA checks, quick conversions, debugging, content cleanup, and internal team workflows. The page focuses on clear inputs, immediate feedback, and output that is easy to reuse in code, reports, tickets, emails, or notes.
Practical tips
Before copying the final result, check important details such as spacing, casing, filenames, encoding, token structure, line breaks, or output format. Small checks prevent mistakes when the result is reused in source code, API requests, documentation, spreadsheets, or shared files.