Enter the size
Type the number, for example 500 for 500 megabytes, or 8 for 8 gibibytes.
Unit converters
Data Size Converter (bytes, KB, MB, GB)
Free online data size converter
Convert a value
Local processingConverted result
All conversions
Enter a value above to see every unit conversion.
Press Ctrl or Command and Enter to run the tool.
About this tool
About this tool
Data Size Converter converts between bits, bytes, and all common multiples in both decimal (powers of 1000, labeled KB, MB, GB) and binary (powers of 1024, labeled KiB, MiB, GiB) systems. Type a value, choose source and target units, and the result plus a table of every unit update instantly. All conversion runs locally in your browser.
Convert file and storage sizes without guessing whether a gigabyte means 1000 or 1024 megabytes. This tool supports both conventions side by side: decimal units such as KB, MB, and GB, and binary units such as KiB, MiB, and GiB. Perfect for comparing download limits, disk space, and file sizes across operating systems.
Built for daily work
- Check if a 4 GB USB stick can hold a folder reported in MiB.
- Convert a download limit from GB to MB for a data plan.
- Compare SSD capacity advertised in TB with files measured in GiB.
- Translate video file sizes between MB and MiB for upload limits.
How to use this tool
How to use this tool
Choose the units
Pick the source unit and the target unit. The table groups decimal and binary units so the difference is visible at a glance.
Compare systems
Use the table to see how the same size reads in decimal versus binary, which explains why drives and files report different numbers.
Key features
Key features
Decimal and binary in one tool
KB, MB, and GB follow powers of 1000; KiB, MiB, and GiB follow powers of 1024. Both are available with clear labels.
Bit and byte support
Convert bits and bytes as well as all multiples, useful for internet speeds and file sizes.
Exact powers
Every conversion uses the precise power relationship, for example 1 MiB = 1048576 bytes and 1 MB = 1000000 bytes.
Instant results
The main result and the full table update with every keystroke, fully client-side.
Practical use cases
Practical use cases
- Check if a 4 GB USB stick can hold a folder reported in MiB.
- Convert a download limit from GB to MB for a data plan.
- Compare SSD capacity advertised in TB with files measured in GiB.
- Translate video file sizes between MB and MiB for upload limits.
- Convert internet speed from megabits to megabytes per second.
Private by default
For local tools, input is processed in your browser and is not sent to application analytics.
Data processing noticeTechnical details
Technical details
ProcessingLocal browser processing
SystemsDecimal (powers of 1000) and binary (powers of 1024)
RangeBits to petabytes and pebibytes
InputFree numeric entry
Limitations and important notes
Limitations and important notes
- The tool converts data sizes, not transfer times; throughput depends on real network conditions.
- Unit names follow the IEC binary standard for KiB, MiB, and larger.
- Very large values are shown in scientific notation.
Frequently asked questions
Frequently asked questions
MB is decimal: 1 MB = 1000 KB = 1,000,000 bytes. MiB is binary: 1 MiB = 1024 KiB = 1,048,576 bytes. Drive makers usually use decimal; operating systems often report binary.
The drive capacity is quoted in decimal gigabytes, while many operating systems display capacity in gibibytes. 500 GB = 465.66 GiB, which explains the difference.
Divide the speed in megabits per second by 8 to get megabytes per second, then account for decimal versus binary units and protocol overhead.
Use decimal when comparing storage advertising and quotas, and binary when matching what your operating system displays. The tool shows both.
Related guides and solutions
Related guides and solutions
Convert any unit online in one place
Recipes, packages, workouts, travel, and coursework all need unit conversions. The online [length converter](tool:length-converter) covers nine categories in one place, with instant results and a full conversion table on every page, so you never need to remember a formula.
Learn moreSkip the converter app and convert in your browser
Converter apps take up storage, demand updates, ask for permissions, and often hide features behind accounts. The browser [length converter](tool:length-converter) replaces them: open one URL, type a value, and convert any unit with nothing to install, update, or grant access to.
Learn moreWhat local browser processing means for online tools
A transparent explanation of local tool processing, temporary browser memory, local storage, downloads, analytics boundaries, and cases that require remote services.
Learn moreRelated tools
Related tools
Unit converters
Speed Converter (km/h, mph, knots)
Convert speeds between kilometers per hour, miles per hour, meters per second, knots, and feet per second instantly.
Open toolImage tools
Image Compressor
Compress JPG, PNG, WebP, and AVIF images locally with quality controls and before/after previews.
Open toolPDF and document tools
PDF Compressor
Compress PDF documents locally in browser memory without server uploads.
Open tool