16-stage chat compressor · MIT · no account

Sixteen cuts.
Fewer tokens.
Same answer.

Paste a chat payload. Max Token Saver folds echoes, prefixes, tool dumps, and repeated context — in your browser. Nothing is uploaded. One file, zero dependencies, free to take.

Compress a payload Watch how

File: 12 KB
Stages: 16
Login: None

A faceted crystal staff resting on a stack of paper in low light. — Safe by default. Tags stay self-describing. Referents stay in the payload.

Use it

Compress in the browser

Paste JSON, an OpenAI-style export, or role: lines. Compression never leaves this device.

Include dialect note

Control + Enter to run

Payload in

[
  {
    "role": "system",
    "content": "You are a careful coding assistant for Jonathan Rivera Studios."
  },
  {
    "role": "user",
    "content": "Project context: Jonathan Rivera Studios — review alpha notes."
  },
  {
    "role": "user",
    "content": "Project context: Jonathan Rivera Studios — review beta notes."
  },
  {
    "role": "assistant",
    "content": "The crystal staff holds sixteen cuts through the prompt body."
  },
  {
    "role": "user",
    "content": "The crystal staff holds sixteen cuts through the prompt body. ok?"
  },
  {
    "role": "user",
    "content": "{\n  \"a\": 1,\n  \"b\": null,\n  \"c\": \"\",\n  \"d\": [1, 2, 3]\n}"
  },
  {
    "role": "tool",
    "content": "crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut "
  },
  {
    "role": "assistant",
    "content": "Answer lives here before the cut.\n---\ncrystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut crystal-staff-cut "
  },
  {
    "role": "assistant",
    "content": "Answer lives here before the cut.\nSecond shard."
  },
  {
    "role": "assistant",
    "content": "Semantic cache stores normalized hashes of long repeated assistant briefs about token folding. Semantic cache stores normalized hashes of long repeated assistant briefs about token folding. "
  },
  {
    "role": "user",
    "content": "Semantic cache stores normalized hashes of long repeated assistant briefs about token folding. Semantic cache stores normalized hashes of long repeated assistant briefs about token folding. "
  },
  {
    "role": "user",
    "content": "Please summarize the Max Token Saver sixteen stage compressor for chat payloads now."
  },
  {
    "role": "user",
    "content": "Please summarize the Max Token Saver sixteen stage compressor for chat payloads today."
  },
  {
    "role": "user",
    "content": "Same context block repeated."
  },
  {
    "role": "user",
    "content": "Same context block repeated."
  },
  {
    "role": "user",
    "content": "hello     world\n\n\n\nkeep\t\tgoing   "
  },
  {
    "role": "user",
    "content": "```js\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\nfunction heavy() { return 1; }\n```"
  }
]

Payload out

The sixteen cuts

Each stage is a named cut

Safe mode keeps referents in the payload. Tags describe themselves. Lossy mode adds CheapGate and a tighter history zip — only when you ask for it.

EchoFold
01
Drops a user turn that is mostly quoting the previous assistant message.
The original assistant answer stays. The echo is gone.
StickyPrefix
02
Lifts a repeated prefix into sticky:LINE and replaces later copies with ⟦sticky⟧.
The prefix is stored once, in-payload.
DeltaTurns
03
Writes later same-role turns as Δ+ from the shared prefix.
The first full turn remains the referent.
SemCache
04
Replaces duplicate long messages with ⟦dup:hash⟧.
The first copy of the text stays.
FuzzyHit
05
Marks near-copies as ⟦fuzzy:i⟧ of a kept original.
The kept original is still in the payload.
RoleMerge
06
Joins consecutive assistant or tool turns and strips exact repeated lines.
User and system turns are never merged.
JsonThin
07
Compacts JSON and drops nulls and empty strings.
Non-JSON text is left alone.
ToolTrim
08
Caps oversized tool bodies, keeping a head and a tail.
A ⟦trim:n⟧ marker records the original length.
HistZip
09
Replaces the middle of a long history with a short digest.
JSON, code fences, the first turn, and the recent tail stay.
TokBudget
10
Drops oldest non-system turns until a token budget is met.
System notes and the latest turn are pinned.
CheapGate
11
In lossy mode, keeps only the last few turns for short yes/no asks.
Off by default. Safe mode never runs this.
StopEarly
12
Cuts assistant or tool text at ---, long blank runs, or <|end|>.
The answer before the cut remains.
DedupCtx
13
Removes exact duplicate role + content turns.
The first occurrence stays.
FilePtr
14
Replaces large fenced code with a short preview and a file pointer.
A preview of the first and last lines stays in the turn.
BatchTwin
15
Merges two near-identical consecutive user asks.
The longer of the two asks is kept, marked ⟦batch⟧.
Whiteout
16
Collapses extra spaces and blank lines.
Words are unchanged.

Learn

Three short films

Watch the cut, then do it in the playground. Captions are the tutorial; the picture is the mood.

Paste, compress, copy

01Paste a JSON array, an export with a messages field, or role: lines.
02Press Compress, or Control + Enter.
03Read the token drop. Copy or save the smaller payload.

How the sixteen cuts work

01Safe mode runs every stage except CheapGate.
02Each cut is tagged. The original text it points at stays in the payload.
03Open Advanced cuts to skip a stage, cap tools, or set a token budget.

Download one file and drop it in

01Get max-token-saver.js — 12 KB, no packages.
02Call saveTokens(messages) in Node or the browser.
03Ship the compressed messages to your model. Keep the dialect note so the model can read the tags.

Get the file

Open, free, one file

MIT licensed. No signup. No telemetry. Drop the script next to your chat client, or keep using this page.

max-token-saver.js

12 KB · UMD · Node + browser

max-token-saver.test.js

Self-test · node file.test.js

Zip + types + license

js · test · d.ts · MIT

Node

const mts = require("./max-token-saver.js");
const result = mts.saveTokens(messages, { mode: "safe" });
console.log(result.stats.saved, result.messages);

Browser

<script src="./max-token-saver.js"></script>
<script>
  const result = MaxTokenSaver.saveTokens(messages);
  // result.messages  result.stats.inTokens  result.stats.outTokens
</script>

Original compressor by JRS / @WallyX716. Safe by default: tags stay self-describing and referents stay in-payload. Token counts on this page are the library’s own estimate (characters ÷ 4).

Read the MIT license

Sixteen cuts.Fewer tokens.Same answer.

EchoFold

StickyPrefix

DeltaTurns

SemCache

FuzzyHit

RoleMerge

JsonThin

ToolTrim

HistZip

TokBudget

CheapGate

StopEarly

DedupCtx

FilePtr

BatchTwin

Whiteout

Paste, compress, copy

How the sixteen cuts work

Download one file and drop it in

Sixteen cuts.
Fewer tokens.
Same answer.