1 GB sample files
A 1,073,741,824-byte file: the largest size this site creates, and the per-file limit of Slack. Available in all 54 formats.
Create a 1 GB file
Each file is exactly 1,073,741,824 bytes and is a valid file of its format. Files this large are not stored anywhere: the button creates the file in your browser. In browsers that can stream to disk (current Chrome, Edge and Firefox on computers and Android) it goes straight into your downloads list and never has to fit in memory; it takes from a few seconds to a few minutes, depending on your device and the format. Other browsers, including Safari and every browser on iPhone and iPad, can only make smaller files, and the buttons say so before you start.
Generated locally in your browser; the output is not uploaded by this tool. Maximum practical size depends on your browser, device memory and available download APIs.
| File | Format | Size | Contents | Create |
|---|---|---|---|---|
| 1 GB Avro samplesample-avro-1gb.avro | Avro | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB BIN samplesample-bin-1gb.bin | BIN | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB BMP samplesample-bmp-1gb.bmp | BMP | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB CSS samplesample-css-1gb.css | CSS | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB CSV samplesample-csv-1gb.csv | CSV | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB DOCX samplesample-docx-1gb.docx | DOCX | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB EML samplesample-eml-1gb.eml | EML | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB EPUB samplesample-epub-1gb.epub | EPUB | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB FLAC samplesample-flac-1gb.flac | FLAC | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB GeoJSON samplesample-geojson-1gb.geojson | GeoJSON | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB GIF samplesample-gif-1gb.gif | GIF | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB glTF samplesample-gltf-1gb.gltf | glTF | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB GPX samplesample-gpx-1gb.gpx | GPX | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB GZ samplesample-gz-1gb.gz | GZ | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB HTML samplesample-html-1gb.html | HTML | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB iCalendar samplesample-ics-1gb.ics | iCalendar | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB ICO samplesample-ico-1gb.ico | ICO | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB INI samplesample-ini-1gb.ini | INI | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB JavaScript samplesample-js-1gb.js | JavaScript | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB JPG samplesample-jpg-1gb.jpg | JPG | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB JSON samplesample-json-1gb.json | JSON | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB JSONL samplesample-jsonl-1gb.jsonl | JSONL | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB KML samplesample-kml-1gb.kml | KML | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB LOG samplesample-log-1gb.log | LOG | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB M4A samplesample-m4a-1gb.m4a | M4A | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB Markdown samplesample-md-1gb.md | Markdown | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB MKV samplesample-mkv-1gb.mkv | MKV | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB MOV samplesample-mov-1gb.mov | MOV | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB MP3 samplesample-mp3-1gb.mp3 | MP3 | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB MP4 samplesample-mp4-1gb.mp4 | MP4 | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB OBJ samplesample-obj-1gb.obj | OBJ | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB ODS samplesample-ods-1gb.ods | ODS | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB ODT samplesample-odt-1gb.odt | ODT | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB PDF samplesample-pdf-1gb.pdf | 1 GB1,073,741,824 bytes | Created in your browser | ||
| 1 GB PNG samplesample-png-1gb.png | PNG | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB PPTX samplesample-pptx-1gb.pptx | PPTX | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB RTF samplesample-rtf-1gb.rtf | RTF | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB SQL samplesample-sql-1gb.sql | SQL | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB SRT samplesample-srt-1gb.srt | SRT | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB STL samplesample-stl-1gb.stl | STL | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB SVG samplesample-svg-1gb.svg | SVG | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB TAR samplesample-tar-1gb.tar | TAR | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB TIFF samplesample-tiff-1gb.tiff | TIFF | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB TOML samplesample-toml-1gb.toml | TOML | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB TSV samplesample-tsv-1gb.tsv | TSV | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB TXT samplesample-txt-1gb.txt | TXT | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB WAV samplesample-wav-1gb.wav | WAV | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB WebM samplesample-webm-1gb.webm | WebM | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB WebP samplesample-webp-1gb.webp | WebP | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB WebVTT samplesample-vtt-1gb.vtt | WebVTT | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB XLSX samplesample-xlsx-1gb.xlsx | XLSX | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB XML samplesample-xml-1gb.xml | XML | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB YAML samplesample-yaml-1gb.yaml | YAML | 1 GB1,073,741,824 bytes | Created in your browser | |
| 1 GB ZIP samplesample-zip-1gb.zip | ZIP | 1 GB1,073,741,824 bytes | Created in your browser |
What is a 1 GB test file?
A gigabyte is the size at which every shortcut fails. Slack accepts files up to 1 GB, Cloudflare plans below Enterprise reject request bodies far smaller than this, and a file of this size cannot be held comfortably in memory on many phones.
Use it to test long-running uploads and downloads end to end: progress, pause and resume, timeouts, retries, and checksum verification of the result.
In everyday terms: About 1 hour 40 minutes of CD-quality WAV audio, or around 20 minutes of 1080p video at a typical streaming bit rate.
Limits near 1 GB
Published limits in widely used services that a 1 GB file is useful for testing. Limits change, so confirm them in the current documentation before relying on them.
| System | Limit | At 1 GB |
|---|---|---|
| Slack | 1 GB per file | At the limit. |
| Cloudflare (Free, Pro and Business plans) | 100 MB or 200 MB request body | Rejected with HTTP 413. |
| Amazon S3 | 5 GB for a single PUT | Accepted; multipart upload is recommended. |
| FAT32 | 4 GiB minus one byte per file | Fits on a FAT32 USB stick or SD card. |
Good for
- End-to-end tests of very large transfers
- Pause, resume and retry behaviour
- Timeouts and keep-alive settings
- Storage quotas and checksum verification
Transfer time
How long 1,073,741,824 bytes take to move, before any compression.
| 1 Mbit/s (slow mobile or uplink) | 2 h 23 min |
|---|---|
| 10 Mbit/s (basic broadband) | 14 min 19 s |
| 100 Mbit/s (fast broadband) | 1 min 26 s |
| 1 Gbit/s (fibre or data centre) | 8.6 seconds |
Related
1 GB files: questions
- How long does a 1 GB download take?
- About 14 minutes at 10 Mbit/s and about 1.5 minutes at 100 Mbit/s. On a 1 Mbit/s uplink the same upload takes about 2 hours 23 minutes.
- How many bytes is 1 GB?
- 1 GB is 1,073,741,824 bytes on this site. Sizes use binary units, in which 1 KB is 1,024 bytes, 1 MB is 1,048,576 bytes and 1 GB is 1,073,741,824 bytes.
- Where does the 1 GB file come from?
- It is created by a script in your own browser and, where the browser supports it, streamed straight to your downloads list, so nothing is stored on or sent from our server. How long it takes depends on your device and the format. Browsers that cannot stream to disk, such as Safari and every browser on iPhone and iPad, can only make smaller files.