diff --git a/packages/proto-signing/src/testdata/coins.json b/packages/proto-signing/src/testdata/coins.json
new file mode 100644
index 0000000000..84e3358d12
--- /dev/null
+++ b/packages/proto-signing/src/testdata/coins.json
@@ -0,0 +1,26 @@
+[
+  [{"amount": "1", "denom": "ucosm"}, { "denom": "COSM", "exponent": 6 }, "0.000001 COSM"],
+  [{"amount": "10", "denom": "ucosm"}, { "denom": "COSM", "exponent": 6 }, "0.00001 COSM"],
+  [{"amount": "100", "denom": "ucosm"}, { "denom": "COSM", "exponent": 6 }, "0.0001 COSM"],
+  [{"amount": "1000", "denom": "ucosm"}, { "denom": "COSM", "exponent": 6 }, "0.001 COSM"],
+  [{"amount": "10000", "denom": "ucosm"}, { "denom": "COSM", "exponent": 6 }, "0.01 COSM"],
+  [{"amount": "100000", "denom": "ucosm"}, { "denom": "COSM", "exponent": 6 }, "0.1 COSM"],
+  [{"amount": "1000000", "denom": "ucosm"}, { "denom": "COSM", "exponent": 6 }, "1.0 COSM"],
+  [{"amount": "10000000", "denom": "ucosm"}, { "denom": "COSM", "exponent": 6 }, "10.0 COSM"],
+  [{"amount": "1", "denom": "ucosm"}, { "denom": "COSM", "exponent": 2 }, "0.01 COSM"],
+  [{"amount": "10", "denom": "ucosm"}, { "denom": "COSM", "exponent": 2 }, "0.1 COSM"],
+  [{"amount": "100", "denom": "ucosm"}, { "denom": "COSM", "exponent": 2 }, "1.0 COSM"],
+  [{"amount": "1000", "denom": "ucosm"}, { "denom": "COSM", "exponent": 2 }, "10.0 COSM"],
+  [{"amount": "10000", "denom": "ucosm"}, { "denom": "COSM", "exponent": 2 }, "100.0 COSM"],
+  [{"amount": "100000", "denom": "ucosm"}, { "denom": "COSM", "exponent": 2 }, "1'000.0 COSM"],
+  [{"amount": "1000000", "denom": "ucosm"}, { "denom": "COSM", "exponent": 2 }, "10'000.0 COSM"],
+  [{"amount": "10000000", "denom": "ucosm"}, { "denom": "COSM", "exponent": 2 }, "100'000.0 COSM"],
+  [{"amount": "1", "denom": "point"}, { "denom": "POINT", "exponent": 0 }, "1 POINT"],
+  [{"amount": "10", "denom": "point"}, { "denom": "POINT", "exponent": 0 }, "10 POINT"],
+  [{"amount": "100", "denom": "point"}, { "denom": "POINT", "exponent": 0 }, "100 POINT"],
+  [{"amount": "1000", "denom": "point"}, { "denom": "POINT", "exponent": 0 }, "1'000 POINT"],
+  [{"amount": "10000", "denom": "point"}, { "denom": "POINT", "exponent": 0 }, "10'000 POINT"],
+  [{"amount": "100000", "denom": "point"}, { "denom": "POINT", "exponent": 0 }, "100'000 POINT"],
+  [{"amount": "1000000", "denom": "point"}, { "denom": "POINT", "exponent": 0 }, "1'000'000 POINT"],
+  [{"amount": "10000000", "denom": "point"}, { "denom": "POINT", "exponent": 0 }, "10'000'000 POINT"]
+]
diff --git a/packages/proto-signing/src/testdata/decimals.json b/packages/proto-signing/src/testdata/decimals.json
new file mode 100644
index 0000000000..00c44b5ce9
--- /dev/null
+++ b/packages/proto-signing/src/testdata/decimals.json
@@ -0,0 +1,43 @@
+[
+  ["0", "0.0"],
+  ["1", "1.0"],
+  ["12", "12.0"],
+  ["123", "123.0"],
+  ["1234", "1'234.0"],
+  ["0.1", "0.1"],
+  ["0.01", "0.01"],
+  ["0.001", "0.001"],
+  ["0.0001", "0.0001"],
+  ["0.00001", "0.00001"],
+  ["0.000001", "0.000001"],
+  ["0.0000001", "0.0000001"],
+  ["0.00000001", "0.00000001"],
+  ["0.000000001", "0.000000001"],
+  ["0.0000000001", "0.0000000001"],
+  ["0.00000000001", "0.00000000001"],
+  ["0.000000000001", "0.000000000001"],
+  ["0.0000000000001", "0.0000000000001"],
+  ["0.00000000000001", "0.00000000000001"],
+  ["0.000000000000001", "0.000000000000001"],
+  ["0.0000000000000001", "0.0000000000000001"],
+  ["0.00000000000000001", "0.00000000000000001"],
+  ["0.000000000000000001", "0.000000000000000001"],
+  ["0.100000000000000000", "0.1"],
+  ["0.010000000000000000", "0.01"],
+  ["0.001000000000000000", "0.001"],
+  ["0.000100000000000000", "0.0001"],
+  ["0.000010000000000000", "0.00001"],
+  ["0.000001000000000000", "0.000001"],
+  ["0.000000100000000000", "0.0000001"],
+  ["0.000000010000000000", "0.00000001"],
+  ["0.000000001000000000", "0.000000001"],
+  ["0.000000000100000000", "0.0000000001"],
+  ["0.000000000010000000", "0.00000000001"],
+  ["0.000000000001000000", "0.000000000001"],
+  ["0.000000000000100000", "0.0000000000001"],
+  ["0.000000000000010000", "0.00000000000001"],
+  ["0.000000000000001000", "0.000000000000001"],
+  ["0.000000000000000100", "0.0000000000000001"],
+  ["0.000000000000000010", "0.00000000000000001"],
+  ["0.000000000000000001", "0.000000000000000001"]
+]
diff --git a/packages/proto-signing/src/testdata/integers.json b/packages/proto-signing/src/testdata/integers.json
new file mode 100644
index 0000000000..0faa4f5fea
--- /dev/null
+++ b/packages/proto-signing/src/testdata/integers.json
@@ -0,0 +1,19 @@
+[
+  ["0", "0"],
+  ["1", "1"],
+  ["12", "12"],
+  ["123", "123"],
+  ["1234", "1'234"],
+  ["12345", "12'345"],
+  ["123456", "123'456"],
+  ["1234567", "1'234'567"],
+  ["9007199254740991", "9'007'199'254'740'991"],
+  ["9007199254740992", "9'007'199'254'740'992"],
+  ["18446744073709551615", "18'446'744'073'709'551'615"],
+  ["18446744073709551616", "18'446'744'073'709'551'616"],
+  ["340282366920938463463374607431768211455", "340'282'366'920'938'463'463'374'607'431'768'211'455"],
+  ["01", "1"],
+  ["001", "1"],
+  ["0001", "1"],
+  ["00001", "1"]
+]
diff --git a/packages/proto-signing/src/textual/valuerenderers.spec.ts b/packages/proto-signing/src/textual/valuerenderers.spec.ts
index e3f7021d55..2a4f54d5cc 100644
--- a/packages/proto-signing/src/textual/valuerenderers.spec.ts
+++ b/packages/proto-signing/src/textual/valuerenderers.spec.ts
@@ -1,4 +1,12 @@
-import { formatInteger } from "./valuerenderers";
+import { DenomUnit } from "cosmjs-types/cosmos/bank/v1beta1/bank";
+import { Coin } from "cosmjs-types/cosmos/base/v1beta1/coin";
+
+import coins from "../testdata/coins.json";
+import decimals from "../testdata/decimals.json";
+import integers from "../testdata/integers.json";
+import { formatCoin, formatDecimal, formatInteger } from "./valuerenderers";
+
+type TestDataCoins = Array<[Coin, Pick<DenomUnit, "denom" | "exponent">, string]>;
 
 describe("valuerenderers", () => {
   describe("formatInteger", () => {
@@ -10,6 +18,34 @@ describe("valuerenderers", () => {
       expect(formatInteger("12345")).toEqual("12'345");
       expect(formatInteger("123456")).toEqual("123'456");
       expect(formatInteger("1234567")).toEqual("1'234'567");
+
+      for (const [input, expected] of integers) {
+        expect(formatInteger(input)).withContext(`Input '${input}'`).toEqual(expected);
+      }
+    });
+  });
+
+  describe("formatDecimal", () => {
+    it("works", () => {
+      expect(formatDecimal("1234.5678")).toEqual("1'234.5678");
+
+      for (const [input, expected] of decimals) {
+        expect(formatDecimal(input)).withContext(`Input '${input}'`).toEqual(expected);
+      }
+    });
+  });
+
+  describe("formatCoin", () => {
+    it("works", () => {
+      expect(formatCoin({ amount: "1", denom: "ucosm" }, { denom: "COSM", exponent: 6 })).toEqual(
+        "0.000001 COSM",
+      );
+
+      for (const [coin, unit, expected] of coins as TestDataCoins) {
+        expect(formatCoin(coin, unit))
+          .withContext(`Input '${JSON.stringify(coin)}'`)
+          .toEqual(expected);
+      }
     });
   });
 });
diff --git a/packages/proto-signing/src/textual/valuerenderers.ts b/packages/proto-signing/src/textual/valuerenderers.ts
index 148f3c2fae..81023cff68 100644
--- a/packages/proto-signing/src/textual/valuerenderers.ts
+++ b/packages/proto-signing/src/textual/valuerenderers.ts
@@ -1,5 +1,19 @@
 import { Decimal } from "@cosmjs/math";
+import { DenomUnit } from "cosmjs-types/cosmos/bank/v1beta1/bank";
+import { Coin } from "cosmjs-types/cosmos/base/v1beta1/coin";
 
 export function formatInteger(input: string): string {
   return Decimal.fromAtomics(input, 0).toString(".", "'");
 }
+
+export function formatDecimal(input: string): string {
+  let out = Decimal.fromUserInput(input, 18).toString(".", "'");
+  if (out.indexOf(".") === -1) out += ".0";
+  return out;
+}
+
+export function formatCoin(input: Coin, unit: Pick<DenomUnit, "denom" | "exponent">): string {
+  let out = Decimal.fromAtomics(input.amount, unit.exponent).toString(".", "'");
+  if (unit.exponent !== 0 && out.indexOf(".") === -1) out += ".0";
+  return out + " " + unit.denom;
+}