⚡ Free to start — no credit card required

Spend less on AI.
Get more done.

Promptolian compresses your prompts before they reach the LLM — fewer tokens, lower API costs, faster responses. Works on Claude, ChatGPT, Gemini and Copilot. Runs locally. Your prompts never leave your machine.

Try live demo → See how it works API docs
Up to 33% shorter prompts
3 compression layers
69% tool schema CR (turn 1)
100% fact preservation (71 benchmarks)
5 languages supported
Works on 5 AI platforms
Live demo
See Promptolian in action

Type any AI prompt and see how much shorter it gets. Toggle telegraphic mode for extra savings.

—
—
Original tokens
—
Compressed tokens
—
Saved
≥98%
Fact preservation
Tier:
Example:
Standard Runs entirely in your browser — instant, private, no data sent anywhere. ~15–20% shorter.
How it works
Three compression levels

Each level goes deeper and saves more. Start free — upgrade when you want bigger savings.

Free · In-browser · Instant
Standard
15–20%
tokens saved
Replaces common phrases with short symbols and strips obvious filler words. Runs entirely in your browser — instant, private, no server needed.
Instant Private EN + ES Free forever
Server · Pro
Smart Grammar
30–35%
tokens saved
Adds Standard compression plus grammar analysis — safely removes helper verbs, filler adverbs, and weak pronouns that don't change your meaning. Works in 5 languages.
EN/IT/FR/DE/ES ~0.1s per prompt Meaning-safe Pro plan
Server · Developer
NLP-Powered
up to 33%
tokens saved · 40%+ on DevOps & infra prompts
The deepest level. Uses NLP (spaCy) to score every clause in your prompt — removing what can be inferred, keeping what matters. Runs entirely on your machine. No data sent to any AI service.
Best savings ~0.3s per prompt EN/IT/FR/DE/ES Developer plan
Smart Protection
Your numbers and facts are always safe
Before compression starts, Promptolian locks every number, URL, file path, and technical name in your prompt. They are restored exactly after compression — never touched or changed. In tests across 100 real-world prompts, 98.4% of facts survived perfectly. When a prompt is very fact-heavy (like a legal contract), Promptolian automatically uses lighter compression so nothing important gets lost.
Features
Everything built in
⚡
One-click compression
Click Compress in the browser toolbar. Promptolian encodes your prompt and injects it. One click to restore. Zero friction.
🔒
Numbers and links stay intact
Every number, URL, file path, and version number is locked before compression and restored exactly after. Nothing gets mangled — 98.4% accuracy measured across 100 prompts.
🌐
Works on 5 AI platforms
Chrome and Firefox extensions add a compress button directly on Claude, ChatGPT, Gemini, Copilot, and Perplexity. Restores with one click too.
📊
Savings tracker
See how many tokens you've saved over time, broken down by site. 7-day chart in the extension popup. Pro plan feature.
🔧
Custom shorthand rules
Add your own shortcuts: e.g. "quarterly business review" → "QBR". Company jargon and internal terms handled automatically. Pro plan feature.
↩
Auto-compress on send
Prompts get compressed automatically when you hit Enter — no extra click needed. Compression happens instantly, before the message is sent. Pro plan feature.
✂️
Smarter word removal
Filler words, helper verbs, and weak pronouns are removed when they don't affect meaning. Negation and passive voice are always preserved. Standard feature on all plans.
⚡
Smart word shortening
Long words in long prompts are shortened to common abbreviations (configuration → cfg, parameters → params). Keeps prompts readable while cutting length.
🔑
100% private — no tracking
Standard compression runs entirely in your browser. Your prompts never leave your device. No logs, no tracking, no data collected.
🔌
Developer API
Send prompts via REST API and get back compressed text. All three compression levels, language detection, and domain vocabularies available. Developer plan feature.
📈
Side-by-side comparison
Compare all three compression levels on the same prompt and see the savings difference. Available in the research dashboard for Developer plan users.
Vocabulary
8 domain packs

Each domain pack adds specialist abbreviations. Free packs are on by default. Pro packs are opt-in.

💻
Tech & General
~90 rules
Free
💰
Finance
28 rules — MRR, ARR, CAGR, ROI…
Free
⚖️
Law
18 rules — NDA, GDPR, SLA…
Free
📊
Data Science
31 rules — RMSE, PCA, EDA…
Free
📣
Social & Marketing
20 rules — CTR, CPC, SEO…
Free
🏥
Medical
39 rules — HTN, MI, ECG…
Pro
🎓
Academic
33 rules — RCT, CI, meta-analysis…
Pro
🏛️
Legal Pro
25 rules — MSJ, pltf, deft…
Pro
Language support
Compress in 5 languages

Language is detected automatically — no setup required. All three compression levels work with English. Spanish, Italian, French, and German also supported.

🇬🇧
English
Standard ✓ Smart Grammar ✓ AI-Powered ✓ Telegraphic ✓
Full support. All three compression levels available. Works on all 5 AI platforms.
🇪🇸
Spanish
Standard ✓ Smart Grammar ✓ AI-Powered ✓ Telegraphic ✓
Symbol compression and grammar cleanup both available. AI-powered compression also supported.
🇮🇹
Italian
Standard — Smart Grammar ✓ AI-Powered ✓ Telegraphic ✓
Grammar cleanup and AI-powered compression available. Symbol compression coming soon.
🇫🇷
French
Standard — Smart Grammar ✓ AI-Powered ✓ Telegraphic ✓
Grammar cleanup and AI-powered compression available. Symbol compression coming soon.
🇩🇪
German
Standard — Smart Grammar ✓ AI-Powered ✓ Telegraphic ✓
Grammar cleanup and AI-powered compression available. Compound words handled carefully — only filler words removed.
Experimental results — v4
Tested across 3 tiers, 200 prompts

200 real-world prompts across 5 industries. All three tiers are fully deterministic — no external API calls, zero latency overhead, 100% private.

CR by domain — Developer tier

IndustryStd CRPro CRDev CR
Finance10.8%11.5%12.9%
Social8.6%9.4%9.7%
Programming11.0%11.7%11.8%
Law8.9%10.3%11.1%
Medical6.7%6.8%7.1%
Overall9.2%9.9%10.5%
200 prompts, engine v4 (tiktoken cl100k_base). Long prompts: Pro 18.4% · Dev 20.1%.

Key metrics — v4 engine, 3 tiers + tool schemas

9.2%
Standard CR
10.5%
Developer CR
69%
Tool schema CR
20.1%
Dev CR (long prompts)
92%
Tool schema (session)
12.9%
Best domain (finance)
200
prompts tested
Tool schemas (JSON function definitions sent on every agent call) are compressed from ~120 tokens/tool to ~37 tokens on turn 1, then to a 3-token reference on subsequent turns — 91.9% average across a 5-turn session.

Long prompts (150–250 words) see the biggest gains: Developer saves 20.1% vs Standard's 15.7%. All tiers run locally — your prompts never leave your machine.
Research dashboard →

Developer API Study v1 — Real-world session savings

10 simulated developer sessions × 5 turns across API design, debugging, DevOps, ML, security and more. Combined metric: query compression + context-window pruning vs naive baseline (full history, uncompressed).

20.1%
Dev CR (long prompts)
33.0%
Combined savings
100%
Fact preservation
101K
Tokens saved/month
46
Tokens saved/turn
10
Dev domains tested
DevOps prompts benefit most (40.9% combined CR) — infrastructure terminology compresses well. All sessions achieve 100% fact score: no numbers, entities or key terms are dropped during compression.

Projection: 20 developer sessions/day × 5 turns × 22 days = 101,254 tokens saved/month, equivalent to $0.03 API cost reduction at standard input rates.
Developer study →
What's next
Development roadmap

Three active research priorities being implemented now.

Priority 1 · In progress
Symbol compression for all languages
Spanish shorthand already live. Italian, French, and German coming next — we're automatically learning the best shortcuts from real prompts in each language.
Priority 2 · In progress
Automatic shortcut discovery
Promptolian will learn new shortcuts from your own prompt patterns and suggest them — like automatically adding an abbreviation for a phrase you use every day in your workflow.
Priority 3 · In progress
Automatic quality check
An automatic check that scores whether the compressed version means the same thing as the original. If the score is too low, compression is paused and you're warned before anything is sent.
Pricing
Simple, transparent pricing

Start free — no credit card, no account required. Upgrade when you need more compression power or API access.

Save 28%

Your API savings estimate

Based on benchmarks: Standard 9% CR avg · Pro 10% · Builder 11% avg / up to 33% with context engine. Results vary by prompt type.

Free
$0
forever
~15–20% shorter — runs entirely in your browser. No server, no account, fully private.
  • ✓Unlimited Standard compressions
  • ✓180+ symbol shortcuts
  • ✓Phrase simplification
  • ✓Language auto-detection (EN/IT/FR/DE/ES)
  • ✓Claude, ChatGPT, Gemini, Copilot
  • ✓Fully local — zero data sent anywhere
  • ✗ Grammar engine
  • ✗ Domain packs
  • ✗ REST API
Pro Popular
$7
per month · cancel anytime
More compression, faster workflow. Grammar engine + domain packs + auto-compress on send.
  • ✓Everything in Free
  • ✓Grammar engine — removes filler words & weak structure
  • ✓All domain packs — finance, legal, medical, code, devops
  • ✓Custom shorthand rules — teach it your vocabulary
  • ✓Auto-compress on send
  • ✓Savings history & 7-day chart
  • ✓Priority support
  • ✗ REST API access
  • ✗ Tool schema compiler
Builder
$19
per month · cancel anytime
For developers & API users. Full REST API, tool schema compiler (69% CR), context engine, Claude Code MCP.
  • ✓Everything in Pro
  • ✓Tool schema compiler — JSON→DSL, 69% turn-1 / 97% cached
  • ✓Context engine — prune, summarise & compress conversation history
  • ✓REST API — /compress, /compress-tools, /optimize-context
  • ✓Claude Code MCP — native tool integration
  • ✓CLI — promptolian compress "..."
  • ✓2M tokens / day
  • ✓Priority support

All plans include Chrome & Firefox extensions. Need more than 2M tokens/day or a team plan? Contact us →

Get started
Up and running in seconds

Install the extension, try it on any AI chat, and see your savings immediately.

Step 1

Install the extension

Add Promptolian to Chrome or Firefox from the extension store. No account required — it's free to start.

Step 2

Open any AI chat

Visit Claude, ChatGPT, Gemini, Copilot, or Perplexity. You'll see the Promptolian toolbar appear automatically in the text box.

Step 3

Type your prompt and compress

Write your prompt as normal, then click Compress. See how much shorter it got — then send. One click to restore the original any time.

Step 4

Watch your savings add up

The extension tracks how many tokens you've saved over time. Upgrade to Pro or Developer to unlock deeper compression and save even more.