API · /aspectratio-api

Aspect Ratio API

healthy 4,198 Subscribers

Aspect-ratio and resize maths on plain dimensions — no image upload needed. The ratio endpoint reduces a width×height to its simplest integer ratio (1920×1080 → 16:9), its decimal value and a common name. The resize endpoint scales a dimension while preserving the ratio: give a new width or a new height and get the other side. The fit endpoint fits a source size into a target box using contain (letterbox) or cover (crop), returning the resulting size, the scale factor and the centering offset. Perfect for responsive layouts and CSS aspect-ratio, video and thumbnail framing, image-grid planning and print sizing. Pure local computation — it works on numbers only and never touches image files. Live, nothing stored. 4 endpoints. Distinct from image processing/resizing (which operates on actual files) and from geometry of shapes.

#aspect-ratio #resize #dimensions #layout #video #developer-tools

api.oanor.com/aspectratio-api

Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/aspectratio-api/openapi.json

/api/aspectratio-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 87 ms; Server probes · 24h
Subscribers: 4,198; active
Total calls: 60; last 7 days

Full status page → · 20 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

840 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
840 calls/month
2 req/sec
Ratio + resize + fit
No credit card

Starter

€1.50 /month

6,900 calls / month
8 requests / second
Hard cap (429 above quota, no overage)
6.9k calls/month
8 req/sec
Contain + cover + offsets
Email support

Pro

€19.80 /month

129,000 calls / month
20 requests / second
Hard cap (429 above quota, no overage)
129k calls/month
20 req/sec
Layout / media pipelines
Priority support

Mega

€55.80 /month

665,000 calls / month
50 requests / second
Hard cap (429 above quota, no overage)
665k calls/month
50 req/sec
Platform scale
Dedicated SLA

Built by

PremiumApi

Related APIs

Other APIs with overlapping tags.

Image API

Inspect image metadata (dimensions, format, size, colour space, transparency) and resize or convert images between JPEG, PNG, WebP and AVIF straight from a URL. Perfect for thumbnails, format optimisation and on-the-fly image transforms.

api.oanor.com/image-api

Keyboard Layout API

Re-map text between keyboard layouts — the fix for text typed with the keyboard set to the wrong layout. The remap endpoint takes text, a source layout and a target layout, and rewrites each character to the one produced by the same physical key on the other layout. So text accidentally typed on a Dvorak-configured keyboard while you meant QWERTY (or the reverse) is recovered exactly, and because the mapping is position-preserving it round-trips perfectly. It supports QWERTY (US), Dvorak and Colemak, including the shifted symbols, and leaves characters that are not on a remappable key (spaces and accents) untouched. The layouts endpoint returns the full key map for each layout. Everything is computed locally and deterministically, so it is instant and private. Ideal for fixing wrong-layout typing, building text editors and IME tools, layout-learning aids, and cross-layout search. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This remaps between keyboard layouts; for classical ciphers (Caesar, ROT13, Morse) use a cipher API.

api.oanor.com/keyboardlayout-api

Bitrate & Transfer API

Media, file-size and data-transfer maths as an API. The file-size endpoint relates bitrate, duration and file size: give any two and it computes the third — so you can find the size of a video at a given bitrate and length, the bitrate of a file of known size and length, or how long a file will play. The transfer-time endpoint computes how long a file takes to download or upload over a given bandwidth (with optional protocol overhead), or the bandwidth needed to move it within a target time. The storage endpoint works out how many hours of media at a bitrate, or how many items of a given size, fit in a storage capacity. Bitrates use decimal units (kbps, Mbps, Gbps) and sizes are reported in both decimal (KB/MB/GB/TB) and binary (KiB/MiB/GiB/TiB). Everything is computed locally and deterministically, so it is instant and private. Ideal for video and audio encoding, streaming and CDN planning, storage and backup sizing, and download-time estimates. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is bitrate and transfer maths; for plain byte-unit conversion use a bytes API.

api.oanor.com/bitrate-api

Subtitle API

Work with subtitle and caption files — parse, convert and re-sync, entirely locally. The parse endpoint reads SubRip (.srt) or WebVTT (.vtt) text into clean, structured cues — index, start, end (as both HH:MM:SS,mmm timecodes and milliseconds), duration and the cue text (multi-line preserved) — auto-detecting which format you sent. The convert endpoint converts between SRT and WebVTT, getting the details right: the timestamp separator (comma for SRT, dot for WebVTT), adding or removing the WEBVTT header, and renumbering cues. The shift endpoint moves every timestamp by an offset in milliseconds, positive or negative, to fix a track that runs early or late, clamping at zero so nothing goes negative. Everything is computed locally and deterministically, so it is instant and private — your media files never leave the request. Ideal for video and streaming pipelines, caption editors and players, localization and translation workflows, accessibility, and fixing out-of-sync subtitles. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This handles subtitle files; for SMPTE video timecode (HH:MM:SS:FF) use a timecode API.

api.oanor.com/subtitle-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Aspect Ratio API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Aspect Ratio API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for Aspect Ratio API?

Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.

How much does Aspect Ratio API cost?

Aspect Ratio API has a free tier with 100 calls / month. Paid plans start at €1.50 / month with higher quotas and faster rate limits.

Can I cancel my subscription anytime?

Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.

Is Aspect Ratio API GDPR-compliant?

All requests to Aspect Ratio API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Aspect Ratio 3

Meta 1

Pick an endpoint from the list on the left to see its details and try it.

GET /v1/fit

Fit dimensions into a box

Playground

Parameters

Custom headers

Language: Client:

GET /v1/ratio

Simplify an aspect ratio

Playground

Parameters

Custom headers

Language: Client:

GET /v1/resize

Resize keeping the ratio

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Spec

Playground

Custom headers

Language: Client:

Code snippets

curl https://api.oanor.com/aspectratio-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/aspectratio-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/aspectratio-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);

import requests
r = requests.get(
    "https://api.oanor.com/aspectratio-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

Ratings

No reviews yet.

Discussion

Ask questions, share usage tips, get answers from the provider and other developers. Public — anyone can read.

New thread

📌 Pinned 🔒 Locked

· ·

🔒 This thread is locked — no new replies.

No threads yet — start the discussion.

Support

Private 1:1 support with the provider — billing questions, integration issues, account problems. Only you and the provider team can see these threads.

Open new ticket

Describe what you need help with. The provider team gets an email and replies on the ticket page.

No tickets yet for this API.

Subscription active — calls can start immediately.

Send your first request —

Subscription active — copy a snippet and fire off your first call.

Pick a key

Plaintext is shown once at creation — use the prefix as a reminder.

Aspect Ratio API

API health

Pricing

Built by

Related APIs

Image API

Keyboard Layout API

Bitrate & Transfer API

Subtitle API

Frequently asked questions

Parameters

Parameters

Parameters

Code snippets

Ratings

Discussion

New thread

📌 🔒

Support

Open new ticket

Your cookie choices